What happens to the leg muscle of an athlete who runs a marathon race?

The hip flexors and extends work with the quad area and the hamstring to move the leg muscles forward and backward. the hip rotator muscle stabilize the hip joints.
the link below explains in more detail about the leg muscles used in running.

https://adventure.howstuffworks.com/outdoor-activities/running/training/leg-workouts-for-runners1.htm

Ifound this on google “aristotle (384–322 bc) in western scientific taxonomy the greek philosopher aristotle was the first to classify all living things, and some of his groups are still used today, like the vertebrates and invertebrates, which he called animals with blood and without blood.” i hope this you for what your looking for.