Perfect form
Stability ball sit-ups
If the thought of sit-ups takes you straight back to the school sports hall, shake it up with this ball-assisted move
It’s a truth universally acknowledged that a runner in possession of a stability ball should use it once in a while. Harsh but true; runners tend to avoid strength training at all costs, especially moves that involve the core. But here’s the thing; anyone who still believes we should only be strengthening our legs should go to the back of the class right now!