Towel Side Lunge
This is a great exercise to strengthen the hips in the frontal (side) plane of motion, especially the muscles of the inner thighs. The towel creates drag which creates resistance and you can make it either harder or easier based on how much pressure you exert. To start, make sure 80% of your weight is on the your base leg and 20% on the leg with the towel. Push back into the hip and heel of the base leg and reach to the side with the towel leg. Pull back with base leg and the towel leg.