Kevrumbo
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Been doing these for over twenty years since college: no back problems yet! All your power for the lift is comes from the legs: the back has nothing to do with it (if done correctly!). The shoulder shrug at the end takes the momentum of the tanks (generated & applied to by your legs) and gives you just enough vertical clearance to lift over the tailgate/bumper. Then just lay 'em down and slide them into the bed of your truck. Whatever method you lift with, use good body mechanics: Use your legs ("bend your knees, lift with ease"); square up to the load, apply your force evenly and symmetrically; and keep the load as close to your body as possible. . .BigTuna:Thanks for the link, Kevrumbo. exrx is a valuable web site for me.
But I question the wisdom of the jump shrug exercises you point to. I think they would tend to create back problems or aggravate exisiting ones. On the lift and jump there's a risk of straining the lower back, and on the landing, there's compression of the vertebrae beyond that caused by the weight alone, plus added stress on the knees and ankles! Scary stuff! I'd want an orthopedic doctor's recommendation before considering about these....