Core Training is vital to your athletic success and peak performance. The movements in this 15-minute program are designed to stabilize and strengthen your skeletal structure. Your core muscles act to synergize your abdominals, upper and lower back, hips, gluteus, and thigh areas. You can't have effective transfer of energy or power without a strong core. As you begin to work and condition the core, you will notice less fatigue associated with the body breaking down, helping to increase strength and reduce the risk of injury. As you prepare for your marathon, the secret will be the effective transfer of energy from your core to your legs through what we call functional movements. To improve your running stamina and endurance, we're going to increase your running strength through a series of running specific exercises and movements. Remember, you are only as strong as your weakest link! Core Training for runners can be a great addition to your current strength-training program. This 4-week Advanced Core Training Plan is designed for the advanced fitness guru looking to add a maximal challenge to their routine. Each 15 minute training plan will help you get to the next level in creating the "powerhouse" mid section you've been looking for. This plan would be a great addition to your current strength-training routine.