Add Yahoo as a preferred source to see more of our stories on Google. Marlo Alleva demonstrates a reverse plank knee up. Variation is the key to positive changes when it comes to our fitness.

I swapped my standard plank for a reverse plank for 30 days, and honestly, it was challenging, surprisingly effective, and, yes, pretty good fun. Like most people, I’m no stranger to planks. I’ve done ...

For a core- and glute-specific workout, you'll love this eight-move workout from ISSA-certified personal trainer and Under Armour trainer Sydney Torabi. It's quick (done in 20 minutes!), but intense!

When it comes to ab workouts, there’s a nine out of 10 chance they will involve some sort of a plank. The move is a staple for good reason: They’re challenging and certainly bring the burn to your ...

The plank is one of the most commonly performed core-strengthening exercises, and whether you're getting your heart-rate up at Barry's or at home (using a Class FitSugar video, per chance??), there's ...