1. Take a firm underhand grip of the barbell at about shoulder-width apart and allow it to rest lightly on the front of your things
2. Stand tall and strong with your feet placed about shoulder-width apart and a slight bend at the knee
3. Bring the barbell upwards in a curling motion by contracting your biceps. Be sure to hold your wrists strong keeping your elbows in a fixed position at your sides
4. When the barbell reaches the top position, which should be close to your front shoulders, lightly flex your biceps before lowering it back to the starting position in a controlled manner
The primary muscles used in Barbell Bicep Curls are the Biceps.