Shopping Cart Lunges
Ignore those dirty looks you get while you work out at the grocery store and keep on keeping on with these lunges! Not only will your legs be burning as you go around the store but you'll actually get around the store faster! Just make sure that after doing this workout you don't buy too many sweets and negate all those benefits you just got from your workout.
With both hands on the shopping cart and your legs split one in front of the other, bring your back knee down towards the ground by bending your knees. Make sure you stay upright with your hands on the cart, knees stay over your toes and you should feel the burn in your legs and hips. Repeat back and forth as you walk down one aisle then take a break.