Open that drawer, spare that back:

I had to pull some heavy drawers this morning, and they reminded me of a trick I developed when my back was bad. (Half of us will get bad backs sooner or later.) Grab the handle with your fingers, then anchor your thumb on the (non-movable) frame of the thing you are opening. Then rotate your hand (toward the thumb) so that your fingers pull on the drawer. You'll develop good force, and you'll notice your back is not involved AT ALL.