Run intervals 2:00 [4]
ahr:150 max:170
4 x 30 sec sprints
21 sec ahr 158
31 sec ahr 144
33 sec ahr 144
34 sec ahr 151
left hamstring twinged on first sprint, so backed off effort. Might have been better to just stop and not make it worse...
on the h.r. curve, noticed that the peak hrstayed pretty constant at about 165-170, but it didn't recover as much during each 4 minute recovery period