Challenge your nemesis - that idea-stealing co-worker or a non-mowing neighbour - to a contest. The first to drop 10 kilograms, run a 10-minute kilometre or bench press 110kg wins.
The key: "Make sure it's someone you don't particularly like," advises sports scientist and Men's Health exercise adviser Michael Mejia. (It's okay if your rival thinks you're best friends.)
Jan 4, 2013