Here is an exercise to strengthen the gluteus medius - see the second
video for "Hip Clamshells in the Neutral Position".
My physical therapist said to do the exercise with hips straight and to hold for 6 seconds. Do the exercise for about 2 minutes.
I'm sure there is some way to do this with free weights or cables but the resistance bands are ideal. The increase in resistance as the bands lengthen is a plus in my opinion.
This exercise strengthens the gluteus medius, an often neglected muscle important for balance and movement. I believe that this muscle helps maintain leg posture and reduces the risk of knee problems.