smooth muscle
deltoids are a muscle group located in your shoulders
deltoids
The trapezius is an upper back/neck muscle and the deltoids are shoulder muscles
Pecs and lats
The scientific name for the shoulder muscle is the deltoid muscle.
a large triangular muscle covering the joint of the shoulder, the action of which raises the arm away from the side of the body.
deltoids; biceps,triceps
The deltoid muscle draws the arm of a frog forward.
The latissimus dorsi is the muscle responsible for moving the arm posterior or backwards.
The Pectoral major, and part of the deltoids(shoulder)
if you mean bench press, then that is deltoids, triceps, and pectorals (or chest)
Tightness in the rear deltoids can result from muscle overuse, poor posture, or insufficient stretching, often due to activities that involve repetitive shoulder movements or prolonged sitting. Additionally, imbalances in shoulder muscle strength, particularly if the front deltoids are stronger, can contribute to tightness. To alleviate this, consider incorporating targeted stretches and strengthening exercises, while also paying attention to your posture throughout the day.