Step 1 : Introduction to the question "7. If you are picking up a heavy weight from the floor, after bending your knees, what is it essential you keep straight to avoid injury?"
...1. your head 2. your arms 3. your feet 4. your back A good way to injure your back is to pick up a heavy weight whilst bending over. Crouch down, nestle into the weight, grab it and lift with your legs, never your back.