Brett Stewart, an experienced personal trainer and marathon runner who maintains a popular fitness website, has sold over 50,000 books with UlyssesGym-free training is a hot fitness trend that's super popular because it's low-cost, travel-free, and requires no special equipmentWith exercise plans featuring instructional photos and nutritional guidance that can be tailored to individual tastes, this is the ultimate program for utilizing body weight to strengthen and tone every muscle group