Best Answer: The muscles of the inner thighs, also called the hip adductors, respond to a very specific exercise routine. It takes about 15 minutes of exercise three times a week to shape the inner thighs. All you need is an exercise mat to get stared. Try these exercises for a few weeks and you will feel more leg power when you walk, run, or swim. After about ten weeks, you will see new definition in your thighs. Outer Thigh Lift.