Grab a dumbbell and multitask for this move that'll work the inner thighs as well as the triceps. Stand with the feet wide, toes pointed out. Hold a dumbbell with both hands overhead. As you squat down, bend the arms, lowering the dumbbell behind your head. Then straighten the legs and arms, squeezing at the top. Continue like this for 30 seconds, and if it becomes too difficult, place the dumbbell on the floor and continue for 30 more.