When driving, hamstring hurts and ankle swells
In response to the enquiries: Hamstring hurts when pressing on gas pedal, and ankle swelling from driving.”
When pushing down on the gas pedal, the driver consciously exerts the foot muscles forward. This extends and pulls the front and back muscles of the lower leg and the back muscles of the thigh, i.e., the hamstring.
Pain in the hamstring when the muscles extend indicates that the muscles have to be forcefully extended by will. And the reason they have to be forcefully extended is that the hamstring is being kept tense for an extended period of time before the foot moves forward to accelerate, for example, when one steps on the gas pedal after the foot has been motionless for some time while the cruise control is keeping the car at constant speed on a long stretch of highway.
The hamstring is being kept tense by the driver’s seat. This occurs when the knee is above the waistline. This shortens the leg stretch. Thus, when pressing down on the gas pedal, i.e., stretching the already tight hamstring hurts.
Ankle swells up because of localized temporary edema. Infriquent stops to relieve oneself on long distance driving causes fluids to accumulate and gather in “spaces” inside the body. One such space is at the ankle.