Come into an all fours position on an exercise mat with your hands directly under your shoulders and your knees directly under your hips. Lift your knees so they hover a few inches off the floor. Place a dumbbell or kettlebell off to your right side. This is your start position. Maintaining a braced core and neutral spine, lift your left hand from the floor and reach under and across your torso to pull the weight through to your left side. Return the left hand back to the floor and repeat the same movement with your right hand. Reaching under and across to the pull weight back to the right side. Perform this alternating movement for the required number of reps (or time).