A strong core is important for any athlete and especially for sprinters. Core training can be performed on a daily basis or at least 2 to 3 times a week.  One of the best ways to get in a core workout is to do them as a circuit. The circuit should include exercises that target the upper, lower, and cross section of the core area. The circuit can be performed as a timed interval (30 second or 1 minute) for each exercise or as a specific count (25, 50, or 100) for each exercise. There should be a small rest period between each exercise.