Here’s a nice short video from the Smithsonian Channel on adaptations that allow humans to run upright. The video is a great functional anatomy primer and provides insight on the importance of the glutes to running. It also highlights some points that have relevance for talent identification and training. The video does short change the fact these adaptations are specifically for bipedal UPRIGHT running and that by comparison to animal counterparts, humans are actually pretty crappy sprinters (but very good at long distance running).