It not only burns calories, but it also builds leg strength and cardiovascular conditioning. Start by gradually increasing your running time each week until you reach your goal time. For players at any level, running is an excellent way to increase athleticism and flexibility while improving cardio fitness. Cycling!Cycling can also help improve athleticism and cardiovascular conditioning while building soccer endurance. Again, start by gradually increasing your cycling time each week until you reach your goal time. For players at any level, cycling is a great way to improve flexibility and coordination while burning calories. Jumping Jacks!Jumping jacks are a...