Beginner

Australian pull ups with elbows out

Biceps - External rotators - Lower trapezius - Posterior deltoid

Perform an Australian pull-up on a low bar with bent legs.
Try to get your shoulders to the same height as the bar and when bending your arms, bring your elbows outwards, so that there is the least shoulder extension possible.
This way, we will involve the back muscle to a lesser extent and the work will pass to the muscles of the upper back area.