According to Einstein's theory of general relativity we are all travelling through space time anyway. I suppose weighting yourself down could potentially slow your passage thus making your transit through time slower and keeping you younger.
How's that for total abuse of the basic principals of physics?
I did watch a physics video a while ago which talked about the latest world record for the 100m sprint, and they were talking about how technically, from the sprinter's perspective, the duration of his run was slightly different to our perspective. Technically, whenever we move we perform time travel.
Deadlift circuit, huh? I'll be honest: I don't envy you one bit right now.