Hamstring (back side of the thigh). If your foot is pointed you may feel it in the top of your foot.
The ankle does not contain any muscles. To increase the force with which you can flex or extend your foot at the ankle joint, you will need to work on your calf and shin muscles.
foot muscles
Bivalves (which include the Mussel family) do have muscles. The muscles are in the creature's 'foot', which is typically used for digging.
The main muscles involved in stepping up a step are the quadriceps (front of the thigh) which extend the knee and the gluteus maximus (buttocks) which extend the hip. The hamstrings (back of the thigh) also play a role in stabilizing the movement. Additionally, the calf muscles (gastrocnemius and soleus) help with pushing off the ground.
Pointing your toes primarily involves the muscles in the back of the lower leg, such as the calf muscles (gastrocnemius and soleus) and the muscles along the top of the foot (dorsiflexors). These muscles work together to extend and flex the ankle, allowing you to point your toes.
Extensor muscles extend or straighten a body part.
Muscles can contract and shorten
Most of the muscles of the body are exercised when running. Of course the foot and leg muscles are needed the most but the muscles of the torso and upper body are used as well.
An inability to extend the leg would result from a loss of function of the common peroneal nerve, a branch of the sciatic nerve. This nerve provides motor function to the muscles that extend the leg and dorsiflex the foot. Injury or compression of the common peroneal nerve can lead to weakness or paralysis in these muscles, resulting in difficulty extending the leg.
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triceps brachii