These are some great stretches for both the Gluteus Medius and Gluteus Minimus.
The first one is the same as we did for the Gluteus Maximus. While sitting on the edge of the chair, place both feet on the ground keeping your knees at a 90 degree angle, and keep your back straight. Pick up one leg and cross your ankle over your opposite knee. While holding your ankle and your knee in place, and keeping your back straight, lean forward at the hips until you feel a comfortable stretch. Hold for 10-15 seconds, then repeat on the other side.
The second stretch is done while standing. Using a wall for balance, cross the leg furthest from the wall in front of the other. Place one hand on the wall and the other on the hip. Then lean away from the wall, pushing your hip towards it. Hold for 10-15 seconds, then repeat on the other side.