Hi guys. I've been at UPS this time for around 2 weeks doing preload, then my regular job, then loading in the pm (pm is much better). My muscles aren't sore anymore, but my back is killing me. I know that you're supposed to lift with your legs, pivot, etc, but at this speed, how is it actually done? Are there any tricks to it? I just want to make sure that when I can drive in 5 years, I'm not in a wheelchair.