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 ...

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.

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 ...