Hayden Panettiere is one super hero who's in super shape. She tones her legs and maximizes her cardio workouts by working the incline. Adding a little uphill action to your walk or jog will boost your workout and target your backside as well. You don't need a super steep ascent to feel the benefits of working with an incline, just a slight upward angle is all you need. Increase the incline while walking or running on a treadmill, or search for hills to climb on your bike or for a hike.