Perform the lateral gluteus maximus stretch first to maximize the effectiveness of this stretch on the piriformis muscle.

To perform the piriformis stretch:

1. Lie comfortably face up on the floor with your legs straight.
2. Internally rotate your right leg as far as you can so that the toes on your right foot are pointing towards your left foot.
3. Raise your right leg while bending your right knee to 90°.
4. Cross your right leg over your body towards the bottom of your left breast. Make sure you maintain the internal rotation from step 2. Unlike the lateral gluteus maximus stretch, your right hip should not come off the floor at all.
5. Use your hands to gently apply an additional 1 lb. of force to the stretch.
6. Hold this position for 1.5 - 2 seconds then return to the starting position.

Repeat the above steps for a total of 1 - 2 sets of 10 - 15 repetitions on both the right and left side.