Ball Pass

Although this move targets your abs, squeezing a ball between your legs also works your inner thighs. Here's a video demonstrating this effective move.

Lie on your back, holding the ball with straight arms lifted toward the ceiling; raise your legs toward the ceiling too.
Keep your lower back pressed into the floor as you lower the ball above your head and your legs toward the floor.
Return to starting position, and switch the ball so you're holding it between your feet.
Lower your feet to the floor, reaching your arms overhead. Return to starting position.
This counts as one rep. Complete two sets of 10 reps.