The ‘concentration’ curl, where the guy sits on the bench smiling at the camera, his elbow flexed, a dumbbell in his hand moving towards the shoulder, is one of the most commonly seen photographs of ‘weight training’. The truth is this ‘popular’ exercise is missing from the routine of most serious weight trainers! The reason is that it’s amongst the smallest muscles, so it’s performed fewer times a month as compared to the big muscle exercises like squats, dead lifts and chest press.
