Action
It helps to straighten the hip joint and bend the knee joint. It also helps to rotate the knee towards and away from the body.
Disease/Injury
Strain on the hamstring muscles may cause severe pain; it is mostly observed in athletes in sports like running and sprinting.
Muscle Exercise
Weight-bearing exercises are important to strengthen the hamstring muscle. Exercises like seated leg curl, dumbbell lunge, lying leg curl can be performed.
Interesting facts
Proper warm-up before any sustained physical activity is necessary to prevent any muscle strain.