Keep the back loose and the knees locked.
Twist or attempt to make moves other than the lift.
Use the leg muscles to do the lift
Try not to talk to his partner
Keep the stretcher as level as possible.
Use a long backboard at all times.
Use a stair chair whenever possible.
Do all of the above.
Push, rather than pull, a load.
Keep back locked while lifting.
Keep arms straight when pulling
Push or pull from a kneeling position if the weight is below the waist level.