The deltoid ... rear deltoid muscles and all of your primary and secondary pulling muscles. You can also perform an assisted pull-up by adding resistance bands as a counterweight to your body weight.

These are hands down the best deltoid exercises to try ... (lifting your arm laterally away from your body). Posterior or rear deltoid — responsible for shoulder extension.

Engage the lats: “The lats stabilise the rear delt, so doing exercises that build the lats further encourages the activation of the posterior muscles on the shoulder blades,” says Joshi.