This is Greg’s best-selling core training routine and is his “must-do” for runners. After completing this three stage program, you’ll have an incredibly strong core and be ready to tackle your heaviest training loads and advance to the next level of your strength development. Don’t waste time. Greg hand-picked this exercises to be the most efficient and effective. No need to spend hours in the gym. Follow this routine and you’ll get “runner strong” in just a few weeks. “Injury-free is the place to be” is our saying and this program is step one in building an injury-resistant body.. $4.99/year, billed annually. Auto renews every year. Cancel anytime.