HOW: Get set-up laying on your back with your knees bent. Place a foam roller, yoga block, your fists, or any object you feel comfortable with to squeeze in between your distal thighs and knees. You want your thighs to be at least parallel to one another. Perform the exercise by squeezing as hard as you can for a few seconds followed by relaxing, repeat.
FEEL: You will feel the muscles on the inside of your hips and thighs and your groin working with this exercise.
COMPENSATION: Your body shouldn't move with this exercise, keep your low back flat.