Stretch leg muscles? Let me answer, legs are one of the largest muscle groups in the human body. Leg muscles are more important than muscles in other parts of the body. Leg muscles play a more important role in coordinating the whole body. Suggest the following methods to exercise leg muscles. Dumbbell Squat: Hold the dumbbell on your chest, with your legs apart, slightly wider than your shoulders, and your big toe and knees pointing outward at 45 degrees. Bend your knees and keep your spine in the middle. Lunge training: Dumbbells are placed at the sides of your body, and one foot moves forward. The other knee should be bent until it is close to the ground, and then return to its original position. Repeat the above operation with the other foot.