Here in southern Ontario we have been very busy shoveling out from a few back to back snow storms, and I started thinking back when I was younger and what my coach told us. 

If you are looking to jump higher and dunk a Basketball and you are faced with a driveway full of snow I would suggest that you shovel it and use your legs as much as you can. To maximize the load on your legs you will need to get a full shovel (or as much as you can safely lift) and squat when lifting the snow. 

To safely lift snow and to reduce risk of injury you need to keep your back straight and lift with your legs.