Content The three heads of the deltoid then merge together ronnie coleman before steroids they insert on the upper arm bone . Similar to the other posterior deltoid exercises, maintain your arms high and perpendicular to your body—this will maximize rear deltoid activation. Like the barbell row, steroids risks the bent over dumbbell row also targets the rear delts, as a secondary muscle group along with the lats, rhomboids, and traps. The Seated Bent-Over Rear Delt Raise is assessed underneath…