person performing concentration curl seated dumbbell bicep peak isolation short head contraction concentration curl EMG bicep brachii short head activation grip supination anterior deltoid elimination isolation bicep development diagnosis peak vs width vs thickness short head long head brachialis concentration curl target concentration curl technique setup three variables supination tempo extension four common errors fixes…

The barbell row is the standard back thickness exercise. It allows heavy loading, trains the entire posterior chain, and has decades of proven effectiveness. Most serious lifters include it and most serious lifters plateau with it eventually. The plateau often has a simple mechanical explanation: the pronated (overhand) grip and horizontal torso position of the…