I can certainly imagine what you mean — swing heavy bag in a horizontal arc, starting a bit behind you, in your (probably straightened) right arm, and then corner sharply to the left; you have to lean quite a bit further to the left in order to take the corner, and your legs have to push harder than normal, so you feel like you must be speeding round that bend.

Thing is, it's a bit of an illusion. You're only doing the same speed you'd be doing anyway, you're just having to put more effort into it so it *feels* faster. But that's it — you're *putting more effort in*.

If you left the heavy bag at home and put the same effort into, say, walking a bit faster, you'd get there quicker, and expend less energy. Honest.

That's not to say that it isn't enormous *fun* to speed-walk round corners in shopping centres while swinging heavy bags at groin height. :o)
(Sir Reginald Slapknackers last slapped his knackers at, Tue 5 Apr 2011, 21:20, Reply)