If you're short on time but want maximum results, the bear plank may be one of the most effective core exercises for improving running performance, stability, and total-body strength.

When I first started running, I thought a solid core workout looked like blasting through some crunches and sit-ups and then checking for any signs of visible ab definition. It turns out I had core ...

This lunge variation builds a stronger core, hips and legs using minimal equipment.

When I first started running, I thought that a solid core workout involved blasting through some crunches and sit-ups, then checking for any signs of visible ab definition. It turns out that I had ...