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

"The muscles on the outside of your knee and hip are a vital part of lower body stabilization, and the stronger and more stable they are, the less likely you are to experience a knee or hip injury," Ellis notes.

• Lie down on one forearm, facing the side with your hips elevated and feet stacked on top of each other.
• Without allowing your hips to dip, elevate your top leg a few inches into the air, keeping your top foot flexed.
• Then, return to the starting side plank position.
• Repeat for two to three sets of 10-15 reps on each side.