Lift with your knees not your back.
Get help from others or use hand truck, etc.
Doing ANY action with enough repetition and fast enough can cause injury.
- even a one pound weight.
Lift with the knees
Avoid 'twisting' when moving heavy objects
Look straight ahead, not down.
GET HELP from others - don't be stupid, macho went out in the '70s.
Additional hazards from lifting:
Heavy objects can fall on your feet, legs, head, body.
What is in motion tends to remain in motion and the heavier it is the more likely you will be injured when it hits you.