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If you want to improve your running speed it will be helpful to know the 3 phases of the running process and the muscles used in each phase. By understanding this you can train all the muscles used when running for faster running speed.
Figure 1. Drive phase starts when the knee is perpendicular to the ground.
Both the starting and ending positions of the drive phase can be seen side by side in the image below:
The drive phase is powered by three basic muscle groups; the hip extensors, which involve your glutes and hamstrings, your knee extensors, or quadriceps muscle and your ankle plantarflexors, or calf muscles. See image 4 below.
Image 4. Hip Extensors, Knee Extensors and Ankle Plantarflexors power the drive phase of running.