‘In your 20s and 30s, being able to plank for 45-60 seconds is a solid marker of good core endurance,’ says PT Joseph Webb, ...

I've been teaching weightlifting for years, and this is one of the most effective core-strengthening exercises to do without ...

MoMo Productions/Digital Vision/Getty Images via CNN Newsource Maintain proper form when doing a plank. Make sure your back isn't arched and your butt doesn't stick up in the air.

Getty Images “They should be done alongside other exercise modes,” O’Driscoll added, “to provide the maximum range of exercise choices rather than limiting them.” ...

They're a fantastic exercise to keep in your fitness toolbelt because they can help strengthen so many crucial areas of your body. That's why PS created a 30-day plank challenge you can do at home.

By Melanie Radzicki McManus, CNN (CNN) — Planks are widely considered by fitness experts to be a fantastic exercise to strengthen the muscles in your core and elsewhere, no matter your age or ...

Planks may seem daunting but are great for strengthening muscles in your core and elsewhere. Modifications can make the exercise more accessible — or more difficult.