Core Work

A look at all the muscles that make up your core and how you can start to strengthen them.

Sit-ups are one of the least effective ways to strengthen the core.

In addition to being straight-up impressive, this one exercise will help you move and run more efficiently.

The benefits of building core strength go beyond the abs.

Forget six-pack abs. Build a rock-solid core tailored to the demands of running.

Strength training is key for runners of all types. Try these exercises to get started and be ready to tackle any terrain.

Ward off injury on your way to a PR with this streamlined, 10-minute circuit.

Check out Nicole Radziszewski's author page.

After months with a sore back, one runner started doing a plank every day. Here's how it eliminated her pain and helped her form.

Squeeze the sides of your abs with this dynamic move, that will also give you a good full body stretch.

Think those lower abs are too hard to tone? Think again!

This move works your abs and obliques—and is a great way to test where you currently are with core strength.

If you want to add a bit of a challenge to your core routine, there's one small piece of equipment you need to get.

Roll out, roll out—but really, it helps you sleep better at night.

The key to running with power is developing a rock-solid core.

The ninth and final move from our April Ab Challenge is here!

This standing ab move is so basic, but it provides a big payoff.

These sliding moves challenge your core to up its functional strength—a perfect workout for runners to do during strength training.

You made it to April, now try the second move in our nine-part April ab challenge: side planks.

Cardio is king when it comes to melting fat but don't skimp on the core work.