Pilates pro Simone de la Rue demonstrates how to do a plank jack—aka the ultimate cardio and core-strengthening move—with proper form. A little known fact about planks: In addition to working nearly ...

The Copenhagen plank is not your typical core move—it’s a side plank variation where you put your top calf on an elevated ...

I won’t lie - since having three children, my pelvic floor has never quite been strong enough to withstand extended bouts of jumping, so when I heard about the benefits of the jack plank exercise, it ...