Emma Thompson Snags Madonna's Trainer and Ellen Degeneres Goes Veg - January 17 to January 23

You know, even though celebrities can afford the best trainers and chefs, top equipment, and fabulously fresh food, staying fit isn't all fun and games. Keeping track of what your favorite stars do to stay in shape isn't easy, either -- and that's why we do a round-up each week of what the healthiest, fittest stars are doing.

Just click on the picture of your favorite stars above to see what he or she has been up to lately!