Instead of grabbing, place it on the handle, clench your fist and position it diagonally, rest the side of your hand on the handle. Keep your elbows from bending, with your trapezius and scapula relaxed, expand your chest and push only as much as you can. If your trapezius lifts when you push more, it shouldn't happen. Push only to the point where your trapezius doesn't lift. Complete 30 repetitions, but if it seems difficult, just do a little bit.