Upper body workouts can often go heavy on the biceps and triceps, but you don't want to shrug off shoulder exercises. Trainers say that a good deltoid muscle workout does more than help you (literally ...

Arm haulers also engage the core, which helps stabilise the torso and prevent excessive arching through the lower back. ‘If you lift your legs off the floor, the glutes and hamstrings contribute by ...

The triceps muscle crosses two major joints in the body -- the elbow and the shoulder. It's a critical component of upper body biomechanics and is involved in almost every arm movement that exists.

The deltoids are the muscles that cover the front, back and side of the shoulder joint — and they are essential for everyday movements like raising your arms, lifting a child or carrying groceries.