What is the ‘Run the Rack’ Dumbbell method, and how does it build muscle mass?

Have you heard about a dumbbell workout method that involves “running the rack?” It might sound like something you’d find on Instagram workout inspo pages, but actually, it’s an old-school dumbbell method used by bodybuilders to help you reach failure, then move straight on through it.

The method has been credited with helping to pack on muscle mass and increase muscular output by reaching failure at every weight until you’ve finished moving through the rack of dumbbells. Here’s how to do…