Bicycle Crunches
How To: Lay flat on the mat with your hands behind your head and legs stretched out in front of you. Bending your knee, lift your right leg toward your chest and raise your left elbow to meet it, lifting your shoulder blades off the ground. Repeat on the other side.
Alternating Heel Touches
How To: Lay down with your feet flat on the floor and knees bent. Lay arms out on your sides. Using your abs, reach your right hand to your right heel. Switch sides and repeat.
Superman
How To: Lay face down on the mat with your legs stretched straight out behind you and your arms stretched straight out behind you. Lift your arms, chest, and legs off the ground. Hold, release, and repeat.
Wood Choppers
How To: Using a weight, stand with your feet hip-width apart with your weight on one leg. Start by holding the weight in both hands up by your left shoulder. Next, twist to make a chopping motion down towards your right hip. Repeat on the opposite side.