I like this tool.  The last 5 days, I’ve been going much easier and 9t shows in the reduction of my fatigue level (the grey area).  It also shows that my fitness is plateaued.  I think that has more to do with 6 rest days over the past 11 days.  I think if I can maintain 6 easy, 60-80 minute sessions a week, I will keep fatigue in check and make steady improvement in endurance.  That’s a good thing to do if I’m gonna row more than 20 miles in a race in July.