While some of the analysis in this documentary is extremely reductionistic, I applaud the high speed filming, which when played back in super slow motion, captures many of details in Asafa Powell’s stride.  Look for the metatarsal-tibia-femur connection as well as the metacarpal-ulna-humerus connection in the super slow motion sequences (5:50-6:00 and 11:50 to 12:24). Both connections work in spirals. Also of interest: the role over-efforting and “co-contractions” may have played in Asafa Powell’s loss to Tyson Gay (35:26 to 37:05).