Introducing Centr Simply Strong from Centr x stefcorgel. An 8-week progressive program designed for maximum results with minimal equipment, using dumbbells, kettlebells, and bands. You’ll train 4 days a week (35–40 minutes each), combining strength and conditioning to build muscle definition, stamina, and real confidence — from anywhere. Simply Strong is one of three new programs in the Start Strong Challenge, launching Monday, January 5 in the Centr App. Let’s start 2026 strong. You in?