CrewNerd and XGPS160 – Initial impressions

When I row, I generally have both my iphone running CrewNerd and a Speedcoach XL2 in the boat.  I bring the phone because it is a reasonably lonely stretch of river and it is a recommended safety accessory.  Since I need to have it in the boat, I might as well have it do something useful.

I have used both CrewNerd and Rowing In Motion and there are pros and cons of both.  RIM is a great tool for real time feedback in the boat.  CrewNerd has better data export features and good tools to review a workout on the phone including a map view and nifty graphs of pace, rate, HR and stuff.

The major disadvantage of using CrewNerd versus the Speedcoach XL2 is the accuracy, stability and responsiveness of the pace readings.  CrewNerd works off of the GPS in the iphone.  This provides position data on a 1Hz basis, and the application uses this position data to deduce the velocity.  By comparison, the Speedcoach GPS2 has a GPS capability that provides 5 updates per second.  The impact of this is that Crewnerd needs to use significant smoothing to stabilize the coarse position data.  This causes a significant lag, up to 10 seconds between a velocity change in the boat and the pace display on CrewNerd showing a stable, accurate pace.  You can crank the smoothing dow, but then you end up with pace readings that essentially oscillate around the actual pace.

The good folks who developed CrewNerd recommend that the best way to get more accurate and responsive pace display is to pair the iphone with an external GPS receiver.  They recommend the Dual XGS160.  This provides 10Hz position data.  When paired with this receiver, the pace display responds quickly and settles well.

However, CrewNerd seems to be unreliable with the XGPS160 receiver.  Sander (of “Rows-And-All” fame) has previously described having hangups and the freezing of the CrewNerd navigation display when using the receiver.  This morning the same thing happened to me.  I was 11K into a 14K row, and then the pace and distance displays stopped updating.  The HR display was alive and displayed an accurate number.  I’m not sure what’s going on, but I am not sure whether it is better to have a laggy pace display or have the app stop functioning in the middle of a practice or race.

OTW Rate Ladders – Fun in the Black Hole

Yesterday, I was focused on staying under the HR cap and I was OK with letting the rate slide around.  Today, I wanted to work on hitting specific rates with good form.

Plan:

  1. 6 minute rate ladders:  3’@18, 2’@20, 1’@22
  2. Work on crisp finishes and getting a good reach at the catch across the different rates.
  3. Try to stay in the aerobic HR zone.

I ended up working a bit  too hard.  I was chasing the splits on the r18 segments and really pushing the effort on the drive.  I was lightening up on the r20 and r22 pretty well, but I really gave myself no relief in the r18 segments.  I think I have too much muscle memory from the Rojabo workouts I was doing last fall.  I need to work on maintaining perfect form and not put as much oomph into the drive when I row at r18.

I’ll loop back around to this workout again, but next time I want to get the avgHR down a bit.

2015-04-21_10-12-51

2015-04-21_10-13-30

Dist__|_Time__|_Pace___|_Strks_|_SPM__|_DPS__|_AvgHR_|_Remarks
01040_|_05:30_|_2:38.8_|_097___|_17.6_|_10.7_|_125___|_warmup
06040_|_30:00_|_2:29.0_|_549___|_18.3_|_11.0_|_154___|_r18
04100_|_19:49_|_2:25.0_|_409___|_20.6_|_10.0_|_156___|_r20
02200_|_10:16_|_2:20.0_|_229___|_22.3_|_09.6_|_159___|_r22
00820_|_05:04_|_3:05.3_|_091___|_18.0_|_09.0_|_136___|_cool down

Tomorrow:  8×500/r500

Monday: 14K Steady State OTW

Objectives:

  1. Rate 19-21
  2. Pace: Sub 2:30
  3. HR Hard cap at 155
  4. Continue to work on crisp finishes

It was cold and grey this morning, about 45F.  There was a breeze blowing upstream which started about 5mph and built to about 10mph by the time I finished.  So, all my downstream splits were slow and my upstream splits were fast.  I was able to maintain, on average about a 2:25 pace and keep below my HR cap.  So, a little bit of progress.

I felt awful when I started and excellent when I finished, so I guess you have to call that a good day.

Notice the big slow down at the end of the third piece.  That was the building headwind.  The last bit was more exposed than the rest and I wanted to stay at the cap.

Also, notice the rate creeping up.  I was trying to do that.  I wanted to try to focus on taking lighter strokes as I went along to maintain the pace without bumping up the HR.

2015-04-20_17-45-13

2015-04-20_17-45-32

Start_|_Dist_|_Split_|_Pace_|_Strks__|_Rate_|_DPS_|_AvgHR_|_Remarks
00020_|_0960_|_05:29_|_2:51.5_|_093___|_16.9_|_10.3_|_120___|_warmup
00940_|_3000_|_14:25_|_2:24.1_|_282___|_19.6_|_10.6_|_149___|_downriver, calm
04000_|_3000_|_14:14_|_2:22.3_|_282___|_19.8_|_10.6_|_152___|_upriver, tailwind
07000_|_2840_|_14:01_|_2:28.0_|_283___|_20.2_|_10.0_|_153___|_downriver, headwind
09900_|_3080_|_14:43_|_2:23.4_|_304___|_20.6_|_10.1_|_151___|_upriver, tailwind
12980_|_1120_|_05:25_|_2:25.2_|_116___|_21.4_|_09.7_|_155___|_Cool down

Dist__|_Time__|_Pace___|_Strks_|_SPM__|_DPS__|_AvgHR_|_Remarks
00960_|_05:29_|_2:51.5_|_093___|_16.9_|_10.3_|_120___|_warmup
11920_|_57:23_|_2:24.4_|_1151___|_20.1_|_10.4_|_151___|_Main set
01120_|_05:25_|_2:25.2_|_116___|_21.4_|_09.7_|_155___|_cool down
14000_|_08:17_|_2:26.3_|_1360___|_19.9_|_10.3_|_149___|_Total

Tomorrow:  Same thing as today.

Random Intervals on Lake Quinsigamond

The original intent of today’s training was to do a hard 5K from the south end of the lake to the north end, but this was disrupted by events.  I ended up with a 3.3K interval, and two 1.2K intervals.  It was a lovely morning for a row.  Sunny, mid 50s, very little wind.  The water was flat except for some waterskier wakes.  Even those weren’t too bad today.

I warmed up from the boat house to the south end of the lake, including some 20 and 30 stroke bursts working rate up from 24 to 30.  I also did about 1K on the square and felt pretty solid in the boat.

The I set up for my 5K, and took off. My objectives were:

  1. Rate above 26
  2. Pace around 2:15
  3. Keep working on earlier tap down and crisp finishes

Keeping pace on target was a bit of an issue.  The battery that decided to be dead today was the new XGPS160.  I hadn’t charged for a couple of weeks, but I’ve only used it on about 6 outings, so I thought I’d be OK.  Turns out, I was wrong.  I will have to plan to keep it plugged into the charge when I’m not using it.  Without the XGPS, I was back to relying upon the iPhone GPS, and on Crewnerd, that means there is a pretty good lag and the pace hunts around a bit.  I ended up pretty much ignoring the pace and rowing by feel.  If I felt like I was about to die, I knew I was rowing hard enough.    Like my 1K intervals, I found that if I stopped concentrating on my finishes, that I would layback too much and slow down.  When I got back on track, and got really good compression at the catch, and finished well, the boat definitely moved much better.  I’ve heard that about rowing with the Fat2s.  You need to work on the front half of the stroke to get any speed.

So, I had run through a couple of wakes without huge slow downs, and I was getting pretty winded by the time I approached the bridge.  A sculler heading in the opposite direction hailed me and told me that they were starting races soon on the 2K course at the north end of the lake.  I pressed on, hoping that I could sneak north outside the race lanes and finish my 5K.  I sped back up, and went under the bridge, and started to turn to the side of the course.  I turned around to look and there were 3 eights steaming down the course towards the finish.  I was safely out of the way, but there was no way I was going to try to finish a hard 5K in the return lane while they were actually running races, so I pulled the plug with a mixture of regret and relief.  It would have been a tough last 2K, but I wanted to finish what I had started.

What to do now?  I decided to do go from the bridge, back south to the end of the lake, and after a bit of a rest I took off on that project.  I had gotten about 750m into that when the other boats I was out with passed me heading north.  I changed my mind and decided to stop at the narrows after about 1200m, and then do another rep going back north.  Maybe it was a rationalization, but I didn’t want them all to wait for me back at the dock if they were done.  That’s considered a bit rude.

I spun just south of the narrows and did my final rep.  I knew it would all be over in 150 strokes, so I pushed this one a bit harder.  While I was doing that rep, the quad passed me going south again.  Oh well, they weren’t going in after all.

I finished the rep at the bridge, turned south again and pulled my feet out of the shoes.  I rowed my cooldown with my feet out.  Another good way to make sure that I concentrated on my finishes.  The quad passed me heading north this time, and I turned to follow them back to the dock.

It was a pretty strenuous workout.  I was happy with the rate.  I was not as happy with the pace.  My pace on the 3K was around 2:17.  I want to be a lot faster than that.  I don’t think it’s fitness, so I need to keep working technique

2015-04-18_11-21-29

2015-04-18_11-21-49

2015-04-18 11.31.44

Start_|_Dist_|__Time_|_Split Pace_|_Strokes_|_SPM__|_DPS__|_Remarks
00000_|_4073_|_30:35_|_3:45.3_____|_461_____|_15.1_|_08.8_|_warmup
04073_|_3312_|_15:08_|_2:17.1_____|_395_____|_26.1_|_08.4_|_interval #1
10225_|_0435_|_01:50_|_2:06.4_____|_046_____|_25.1_|_09.5_|_rest
07857_|_1228_|_05:37_|_2:17.2_____|_149_____|_26.5_|_08.2_|_interval #2
05916_|_1417_|_06:39_|_2:20.8_____|_169_____|_25.4_|_08.4_|_rest
09368_|_1240_|_05:30_|_2:13.1_____|_150_____|_27.3_|_08.3_|_Interval #3
10608_|_1447_|_10:26_|_3:36.3_____|_176_____|_16.9_|_08.2_|_cd feet out

Distance_|_Time__|_Pace___|_Strokes_|_SPM__|_DPS__|_Remarks
4073_____|_30:35_|_3:45.3_|_461_____|_15.1_|_08.8_|_warmup
5780_____|_26:15_|_2:16.2_|_694_____|_26.4_|_08.3_|_Main set
1447_____|_10:26_|_3:36.3_|_176_____|_16.9_|_08.2_|_Cool down
1852_____|_08:29_|_2:17.4_|_215_____|_25.3_|_08.6_|_rest meters
13152____|_15:45_|_2:52.8_|_1546____|_20.4_|_08.5_|_Total

Tomorrow:  Rest day.

Friday AM: 14K Steady State in the rain

Technology failed me today.  No matter what I tried, I couldn’t get my HR monitor to link up with either my phone or my speedcoach.  I have to assume that it has consumed yet another battery.  I really like the Polar H7, but the battery life is not very good, and seemingly random.  Some batteries last a long time, some of them only last a few weeks.

So, I was flying blind in terms of intensity, and as I always do, I’m sure I pushed too hard due to the lack of the feedback.  Oh well, I had fun pushing too hard.

The weather was less than perfect, and I enjoyed it a lot.  It was 50F and raining, with about a 10mph wind blowing from upriver to downriver.  Rowing downriver, I felt like a god!  The boat felt light and my splits were fast.  Rowing upriver, it was like I had pushed the drag lever up to 8.  Every stroke felt very heavy and the boat had very little run.  It was hard work.

But the good news was that I was able to concentrate on those crisp finishes from yesterday, and getting good compression at the catch.  When I got it right, I was rewarded with a 5 second improvement in boat speed.  When I got sloppy, I slowed right down.

I did two laps of the river.  This is about 20 minutes downriver from launch to the Moody Street dam, then 15 minutes upriver, stopping before the twisty turny part.  Then 15 minutes back down river.  Finally, 20 minutes back home.

2015-04-17 11.36.14 2015-04-17_9-25-30

Tomorrow:  A hard 5.5K on Lake Quinsigamond

Thursday AM: 5x1K / 500m rest OTW

The wind from yesterday was gone.  The water was perfect.  It was a bit cold (around 40F), but it warmed up as I was rowing.  Another beautiful morning to be on the river.

Today’s mission was to mimic the workout that Sander had done yesterday.  He did a 4x1K.  Since mine would no doubt be slower, I decided to add a punishment rep.  Actually, the way things worked out, the end of my fourth rep put me at the far end of the 1K course, so I decided that another rep would be a good idea.

The objectives:

  1. Pace faster than 2:15
  2. Stroke rate 26 to 28
  3. Try to row clean, blades off the water, etc

I did a superlative 6×1000 last August and finished with an average pace of 2:07.0.  That was my best ever 1K interval session.  This was my third session of the season, so I had pretty modest expectations.

Side note:  Water temp this morning was probably around 2C.  In August water tem is around 20C.  From Biorow Vol 9, No 105, the impact of the water temp would be 1.5%.  In other words, a 2:05 split today would be a 2:03 split in 20C water.  I like this side note, it makes me feel faster!

Back to the story.  I started with a long warmup.  I did the OTW warmup that I got to like last season all the way to the dam, and then turned and did reasonable pressure steady state back to the start of the 1K course, another 2.5K or so.

Then into the intervals.  I tried to keep myself under control.  I tend to push so hard that I blow up in OTW interval sessions, so I purposely aimed a bit low.  Nevertheless, I was really working hard in the last third of each interval and even had to ease up a bit in the last couple.  In terms of technique, I found that a winter of erging on slides had had two effects, one positive, one negative.

The positive effect was on the recovery.  I was much better maintaining my balance and fully extending my arms and swing my back before breaking my knees.  This allowed me to maintain balance and control as I went back up the slide to the catch.  I need to take some video, but I didn’t feel like I was bouncing into the catch like last year.

The negative effect was on layback.  On the erg, putting a bit more layback and really pulling the handle all the way to your chest helps your splits a fair amount.  Basically anything that gets more chain out of the machine helps increase your power per stroke.  In the boat, the 2.5M meters that I did on the erg were causing me to wait to long to tap down.  This meant that I had too much layback, my hands would bump my ribs, and that made my finishes sloppy.  I figured this out somewhere in interval number 2, and from there I consciously worked on less layback, earlier tapdown and crisper finishes.  When I got it right, it gave me 2 seconds on my split.  It was hard to consistently get right.  I want to get this on tape too.

So, at the end of the day, I ended up with a 2:08.1 avg, so a second slower than last august.  If I grade it on the tempurature curve, I did better!   I see this as a positive sign for the season.  My fitness is getting better, and my technique needs work.

2015-04-16_16-23-56 2015-04-16_16-23-30

Start_|_Dist_|_Split_|_Pace_|_Strks__|_Rate_|_DPS_|_AvgHR_|_Remarks
00020_|_5680_|_28:44_|_2:31.8_|_552___|_19.2_|_10.3_|_149___|_warmup
05700_|_1000_|_04:17_|_2:08.7_|_111___|_25.9_|_09.0_|_168___|_Interval #1
06700_|_0300_|_02:11_|_3:39.0_|_030___|_13.7_|_10.0_|_138___|_rest
07000_|_1000_|_04:15_|_2:07.3_|_114___|_26.9_|_08.8_|_167___|_Interval #2
08000_|_0500_|_03:14_|_3:14.5_|_055___|_17.0_|_09.1_|_136___|_rest
08500_|_1000_|_04:15_|_2:07.6_|_119___|_28.0_|_08.4_|_168___|_Interval #3
09500_|_0500_|_03:44_|_3:44.2_|_055___|_14.7_|_09.1_|_132___|_rest
10000_|_1000_|_04:17_|_2:08.7_|_118___|_27.5_|_08.5_|_168___|_Interval #4
11000_|_0500_|_03:13_|_3:13.3_|_056___|_17.4_|_08.9_|_138___|_rest
11500_|_1000_|_04:16_|_2:08.1_|_117___|_27.4_|_08.5_|_169___|_Interval #5
12500_|_1360_|_07:37_|_2:48.0_|_147___|_19.3_|_09.3_|_147___|_cool down

Dist__|_Time__|_Pace___|_Strks_|_SPM__|_DPS__|_AvgHR_|_Remarks
05680_|_28:44_|_2:31.8_|_552___|_19.2_|_10.3_|_149___|_warmup
05000_|_21:21_|_2:08.1_|_579___|_27.1_|_08.6_|_168___|_Main set
01800_|_12:23_|_3:26.5_|_196___|_15.8_|_09.2_|_136___|_rest meters
01360_|_07:37_|_2:48.0_|_147___|_19.3_|_09.3_|_147___|_cool down
13840_|_10:06_|_2:31.9_|_1474___|_21.0_|_09.4_|_152___|_Total

Tomorrow:  15K steady state OTW, HR limit 155.

Wed PM: Windy 8K

I flew home from LA, which required me to get up at 4AM.  I arrived at Logan airport around 4pm, and decided that I really, really wanted to go for a row.  The weather indicated that the wind would be 15mph gusting to 25, but I figured that my sheltered little river would be OK.

I was mostly right.  There were some sections where the wind was so strong that I was just trying to hang on.  There were other sections, at the end of a longer exposed section where the waves and whitecaps were big enough to cause significant problems on recovery and wash over the deck of the boat.  But it was glorious nonetheless!  It was great to be out on a sunny day after being cooped up on a plane for 5 hours.

I worked a little too hard for a good quality steady state session, but it was good to get some rough water practice.

2015-04-16_18-53-35 2015-04-16_18-53-17

7K in a double on Lake Quinsigamond

Beautiful day for a row.  Around 40F, and a light wind from the west.  The water was perfect.  We had 8 people this morning so we boated a quad, and two doubles.  I was in one of the doubles with Joe.  Joe is the guy who taught me how to row and is the backbone of our club.  Right now, he is nursing a shoulder injury, so we took it pretty easy today.

At this point, the lake is mostly ice free.  There is still some icy spots at the south end of the lake.  We headed down lake and turned around one of the islands, then headed north until the Gazebo.  There were a bunch of 8+s out getting ready for some racing.

2015-04-12 11.58.54

Most of the row was nice steady state at around a 20 rate.  I was doing my best to keep my legs down until my body position was right for the catch.  I was also working a little bit on trying to keep from going too deep at the catch.  This was pretty sloppy though.

When we turned around the island, we took a short break to try out the drill that I posted.  We took turns trying it, with the other just setting the boat.  That’s the great thing about a double.  You can work on things like this without risking a swim!

Forgot my Heart Rate Monitor, so the graph isn’t nearly as pretty.

2015-04-12_11-54-48

Based on feedback from Sander I decided to get the XGPS160 bluetooth unit to use with CrewNerd.  It worked flawlessly.  With it the Crewnerd pace display responds instantly to changes in boat speed, and you can turn the smoothing all the way down without seeing erratic displays.  So, instead of a Speedcoach GPS II for $400 that provides a 5hz update rate, I have a $149 unit that supports 10Hz updates, and has a better display with my iPhone6.  I think I like the idea of bluetooth enabled accessories and the the iphone as a hub.  Now, if someone releases bluetooth force gauges and impeller, you’d have everything you need to be fully instrumented in the boat!

I had to make some modifications to my spreadsheet, since it is now generating 10x more data.  But that took only a few minutes.

If I can master this drill, I can rule the world!!!

I just saw this post over on rowing related.

It was Megan Kalmoe’s contribution to the Best Rowing Drills series on the web site.

There was one drill called Top Quarter, where you go from catch to quarter slide and repeat.  It looks like it stresses balance and timing in a very challenging way.

I have a lot of trouble confidently maintaining balance going into the catch.  If I can get this drill mastered, I think I’ll be a lot cleaner at the catch.

Friday PM: First Row of the Season – 10K in my fluid

I finished my last meeting of the day around 3pm and decided to get my boat and all my stuff together and head out for the first row of the season.  No training objective other than to see how things felt and enjoy a nice warm afternoon.

One purpose was to get my boat moved onto it’s rack, down in Newton.  I setup my boat, got the rigger back on, put on the speedcoach, put my iphone on it’s new mount and launched without any fuss.

First I headed up stream to my old boathouse and to get the feel of rowing again.  I was a bit tentative for the first dozen or so strokes, but I quickly noticed that my balance was good.  I was keeping one or both blades off the water right away.  I also noticed that I was easily keeping my recovery sequenced right, with my legs all the way down until my arms were extended and my back leaning forward.  I also didn’t feel like I was rushing into the catch.  I need to take some video and get RIM set up to make sure that I am not deluding myself, but I think spending the winter on slides was a very good thing.

It will take a bit of time to get my on the water pacing right.  I was pushing the pace too hard and my HR shows it.  I need to just relax a bit and ease up on the pressure to get a good UT2/UT1 rhythm going.   Anyway, it is all good.  I’m back on the water and I think I am going to row better than I was last season.

2015-04-04 17.35.30

2015-04-04_17-31-55 2015-04-04_17-32-12

Start_|_Dist_|_Split_|_Pace_|_Strks__|_Rate_|_DPS_|_AvgHR_|_Remarks
00020_|_0760_|_04:44_|_3:06.6_|_077___|_16.3_|_09.9_|_099___|_warmup
00780_|_1420_|_06:49_|_2:24.0_|_137___|_20.1_|_10.4_|_157___|_downwind
02420_|_2340_|_11:23_|_2:26.0_|_222___|_19.5_|_10.5_|_161___|_downwind
04760_|_0380_|_01:35_|_2:04.3_|_040___|_25.4_|_09.5_|_173___|_sprint
05160_|_3000_|_15:30_|_2:35.1_|_302___|_19.5_|_09.9_|_162___|_upwind
08160_|_1920_|_10:40_|_2:46.7_|_203___|_19.0_|_09.5_|_154___|_cooldown

It was a bit of an adventure trying to carry my boat over a giant snowbank to get it to it’s rack.  But now it is safe and sound and I can get out and row now!