A straight leg raise works the muscles of the hip, including the gluteus maximus, gluteus medius, and hamstrings. It also works the quadriceps, the muscles in the front of the thigh. Additionally, the calf muscles and the muscles of the lower back are engaged during a straight leg raise.

Straight leg raises should be done two to three times per week. It is important to allow your body time to rest and recover between workouts. You can also vary the intensity of your exercises to prevent overtraining.

Straight leg raises can be a safe exercise if done with proper form. Make sure to keep your back flat on the floor and avoid arching your back during the exercise. Also, be sure to keep your legs straight and avoid bending your knees. Additionally, it's important to move slowly and with control, and stop the exercise if you feel any pain.

Straight leg raises are an effective exercise that can help improve flexibility and strength in the lower body. They can help to improve balance and posture, as well as strengthen the muscles in the hips, glutes, hamstrings, and calves. Additionally, straight leg raises can help to prevent lower back pain and improve circulation in the legs.