Our new video series, STACK Fitness Weekly, brings you the latest and most innovative ideas in fitness. Brought to you in quick-hitting videos, STACK Fitness Weekly delivers the workouts, tips and advice you need to get into the best shape of your life. Whether you’re looking to add muscle, torch body fat, run faster, or simply feel better throughout the day, STACK Fitness Weekly gives you weekly sessions of expert coaching to help you reach your goals.

In our debut episode (above), National Strength and Conditioning Association Certified Strength and Conditioning Specialist (CSCS) and STACK associate content director Andy Haley demonstrates a treadmill interval sprint workout that improves your endurance and burns calories fast.

Check back every Wednesday for new episodes, and visit STACK Fitness for all of your training needs.