You can build up a strong core from structural exercises like squats, but if you really want to hone in on those muscles, you’ll need to target your abs more directly.

Regression: No weight Harness the Long-Run Mindset., founder of Le Sweat and Master SoulCycle Instructor, for a better core workout that will help boost your performance as a runner. Atkins swears by it as more than just an easy prescription for the people she works with—she does the moves herself, too.

Self-Rolling Smart Yoga Mat

Self-Rolling Smart Yoga Mat

“Nine times out of 10, this is the ab routine I use, and I give to all of my clients,” she says. “It’s easy to modify to all athletic levels, and it’s, of course, a killer ab routine.”

[Runner’s World 10-Minute Cross-Training, Summer Running Gear.]

To take on the core series, you can try it with or without an added load. You can use anything to add weight—dumbbells, kettlebells, sandbags, or even just a heavy object you have laying around. Either way, you’ll probably want set up shop on a yoga mat for your back. Check out this option from our Backslash Fit brand if you need a solid one for your home.

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Runner’s World 10-Minute Cross-Training.

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Runner’s World 10-Minute Cross-Training-CPT, PES, a senior editor at Men's Health, is a certified trainer and former pro football player and tech reporter. You can find his work elsewhere at Mashable, Thrillist, and other outlets.