Popsugar Fitness Fitness Gear Stealth Core Trainer Review This Board Turns Holding Planks Into a Fun At-Home Video Game — and I Tested It Out September 10, 2020 by Samantha Brodsky View On One Page Photo 1 of 5 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 How to Do Modified Plank on the Stealth Core Trainer Previous Next Start Slideshow Fitness GearWorkoutsFitness ShoppingHome WorkoutsCore ExercisesPlank