Olympics fun

Notice the nice long strides of Bolt and Wayde van Niekerk. They pull the ground back with the hip extensors and hamstrings to propel themselves forward. An effective cue for walking and running is “pull (or push) the floor back”.  This addresses such problems as those whose Center of Gravity is too far back and for those who lift their legs up too much (prancing pony) which stresses the hip flexors (including posts).