Why it's good: This workout is great for strengthening your booty and your core and getting your heart rate up! If you don't have a ball, you can use light 2-3 pound dumbbells, or omit working out your upper body altogether.
How to do it: Stand with your feet wider than your shoulders and slightly rotated. Squat as low as you can, while still feeling comfortable in your hips. Keeping most of your weight into your heels, stand up (exhale as you do) and rotate towards one side. Pretend you're trying to grow taller as you stand up straight and rotate again, lifting your back heel. Repeat by squatting back to the center and standing to rotate to the other side. Remember to always breathe deeply.