Instructions
Place two dumbbells on the ground in front of you, a little closer than shoulder width apart. Grasp hold of the dumbbells and with straight arms, position your body in a plank like position. Hold your core tight and row one of the dumbbells up to your waist, squeezing your arm back behind you. Your other hand should be pushing down on the dumbbell on the floor. Lower and repeat for desired reps and then repeat on the other side.
Tips
The wider you place your legs, the more stable you will be. To decrease the difficulty of this exercise, you can perform it on your knees. You can also perform this exercise by alternating sides each rep.