This isometric contraction activates your inner-thigh muscles while also engaging the rest of your body—a much more effective way to train than those hip abduction and adduction machines at the gym.
How to do it: Stand with your feet together, arms by your sides. Take a wide step forward with your right foot and lower into a deep lunge position. Place your hands on the floor on the inside of your right foot. Press your right knee into the outside of your right shoulder. Squeeze and hold the contraction for 10 counts. Release and push off the floor with your right leg to return to standing. That's one rep. Repeat with the left leg to complete 1 set. Do 3 sets total.
Form tip: Keep your arms pressed firmly into the floor to provide resistance to your leg as you press it into your shoulder.