The problem is, there's just too much advice out there. Should we be trying to eat like a caveman? Exercise like an Olympic athlete? Subject ourselves to unusual body-sculpting procedures?
We spoke to Garry Kerr, the head of training and operations at British Military Fitness who shared his advice for what you really need to be doing this January.
Common fitness myths busted
LOOKING GOOD AT THE GYM? NO SWEAT WITH THIS COOL SPORTSWEAR
HOW TO GET WHAT YOU WANT THIS YEAR
MORE DIET AND FITNESS ADVICE