Put on your hiking harness, attach a hook to the ceiling in your garage, and attach your mainsheet blocks to both. Spend your afternoon hoisting yourself up and down. If that doesn't get you in shape for sawing the main, I don't know what will.
This brings to mind a great image. When you hoist off the ground, you'll discover that your center of gravity is below mid-point and you flip feet-up head-down, suddenly unhooking and dumping onto your head. Garage door open with neighbors watching, of course! <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />
