Keegan Thornhill on Instagram: "In bodybuilding, we NEVER want to bounce the weight. We want to own every inch of the rep. The stretch reflex is when a muscle quickly contracts after being rapidly lengthened. Think of bouncing out of the bottom of a squat or bench press. It’s your body’s natural safety system to generate momentum and protect joints under speed. But momentum doesn’t build muscle, tension does. If you rely on the stretch reflex to stroke your ego and move more weight, you also red