How to Build a Strong Core Without Sit-Ups
Sit-ups are one of the least effective ways to strengthen the core.
anatomy
The Basics of Building a Strong Core for Running
Forget six-pack abs. Build a rock-solid core tailored to the demands of running.
Sit-ups are one of the least effective ways to strengthen the core.
Forget six-pack abs. Build a rock-solid core tailored to the demands of running.