With practice! Here are a few basic steps to flex your back, namely your Lat muscles: 1. Put your hands on your hips. 2. Retract your shoulder blades, together. 3. Stick your chest out. 4. With your hands on your hips, bring your elbows forward in front of you. 5. Push your shoulders and elbows down, as if you are trying touch your hands with your elbows. You are now Flexing your Lats! If you cannot feel it yet, practice! Bodybuilders practise flexing their muscles for years to get it perfect. The art of being able to show off the muscle you’ve build to the judges when on stage is a big part of bodybuilding competitions! Or more importantly dominating the dance floor in a tight t-shirt.