(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 physical fitness level. There are ...

Psst: it's not another plank.

The world of fitness has crowned a new champion in core training, and it’s not the traditional sit-up. The plank, a deceptively simple exercise, has captured the attention of fitness enthusiasts ...

Why one trainer calls the plank variation "no joke." ...