This time of year many of us are promising to improve our health and fitness levels. Unfortunately these good intentions often don’t last for long. So how’s this for motivation: the chance to win $25,000 in cash!

Bodybuilding and fitness site bodybuilding.com has joined with Optimum Nutrition to run a twelve week personal transformation contest with prize packages worth a total of $100,000. The contest is open to US residents and those wanting to take part need to register before 31st January 2011 and upload “start” photos.

After twelve weeks the winners (one male, one female) will be decided according to two factors: “biggest physical and mental improvement and most inspirational and helpful to others.” Each grand prize winner will receive $25,000 plus other prizes. Ten runners up will each receive $2,500 and prizes.

Ryan DeLuca of bodybuilding.com said:

We set out to create the biggest transformation challenge anyone has ever heard of – no strings attached. Not only that, it was our goal to equip everyone with the tools needed to truly be a success. I must say, we have done just that. If this doesn’t motivate you, I don’t know what will.

For full details of the contest, terms & conditions and registration visit the Transformation Challenge website.