Stand with feet hip-width apart and rise up onto the balls of your feet, then slowly lower back down. You can do this exercise on the edge of a step for an increased range of motion.
If you have access to a leg press machine, use it to perform leg presses. Adjust the weight according to your strength level and push the platform away from your body using your legs.
Lean against a wall with your feet shoulder-width apart and slide your back down the wall until your thighs are parallel to the floor. Hold for as long as you can and then return to original position.
To do this exercise, take a step forward with one leg and lower your hips until both knees are bent at about a 90-degree angle. Hold for a few seconds and then push back up to the starting position. Repeat with the other leg.
Begin by standing with your feet shoulder-width apart. Now, lower your body by bending your knees and pushing your hips back. Make sure you keep your back straight and chest up as you squat down. Come back gently to the starting position.