Daniel J Frey
Every runner knows that you need more than just sturdy legs to achieve personal best performances and to stay injury-free. To reach your optimal running potential, you need a strong and healthy core. Not only will having proper core strength give you toned abs and thighs, but it will also ensure that you maintain good form as your fatigue mounts, and ultimately it will decrease your chances of succumbing to devastating injury. In The Runner's Guide...