The trapezius muscle mass (or traps) are one of the larger sized muscles from the back. The center and lower traps originate and insert together the C7-T12 vertebrae into the lateral 3rd in the clavicle, the acromion process, as well as the backbone of the scapula. Instruction for muscular endurance https://hammer-strength-dumbbell45566.tribunablog.com/top-dumbbell-set-and-rack-secrets-47650183