trail running 16:46 [3] 3.0 km (5:35 / km)
ahr:129 max:147 shoes: Nike Free 7.0
check out before meet; calf is weak but I guess ok to run; stretching halfway and after the run; I've experienced the same problem a year ago but on the other leg and in different spot of calf; strange but it was the beginning of may last year - same time