5 Workout Moves That Strengthen Your Knees, According to a Personal Trainer

"Single leg squats are a fantastic way to address the asymmetry between our right and left sides and work on getting our weaker side stronger," Ellis explains.

• Facing away from the chair, stand on one leg and balance with your opposite foot off the ground.
• Drive your hips back as your knee bends, allowing you to sit on the chair.
• Without putting your floating foot on the ground, drive into your standing leg and return to the starting position.
• Repeat for three to four sets of 8-12 reps on each side.