Kick your ab workout up a notch by adding weights, and you'll work your upper body at the same time. These four moves will effectively give you that burn that lets you know you worked it! Source: Thinkstock
We love the woodchop, and this variation is one of celeb trainer Gunnar Peterson's favorites.
The secret sauce in this exercise: use your abs to control your movement on the way down. Uncurl slowly instead of just letting gravity pull you down.
No arm or core workout would be complete without the mighty plank. Twisting in this classic position fires up the core and works those love handles.
The slow and controlled pulse of this exercise keeps the abs engaged throughout the set, and adding the weight of a medicine ball kicks your abs into high gear and increases the burn. If you don't have a medicine ball, use a dumbbell instead; choose a weight between five and eight pounds.