Sit facing machine with a proud chest, shoulders back and down and hands on handles. Slowly open up with straight arms out to the side. Return to starting position. Repeat.

The posterior deltoids help with many pulling movements and stabilize the shoulder joints. Rowing, pull-ups, and other exercises can help to improve posterior deltoid strength. You need strong ...

Built with Science creator Jeremy Ethier wants to help everyone make gains, no matter where on their body they choose to target. He's recently shared the 14 exercises you need to be doing to build a ...