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.

Exercise scientists Mike Israetel and Milo Wolf teamed up for another classic exercise ranking video—this time focusing on the best and worst shoulder exercises. They went off of five tiers for ...

What are your rear delts? Your deltoid muscle, which looks like a large triangle that was placed over your shoulder (the name “deltoid” actually came from the Greek letter “delta,” which is shaped ...

It's easy to focus on biceps and triceps exercises during my upper-body workout. Sometimes I even throw in some back moves. But my go-to arm routine was missing a major muscle group: rear deltoids.

If you’ve tried your best to improve your posture by simply “standing up straight” only to find yourself defaulting to a rounded spine minutes later, don’t feel bad. Slouching is a tough habit to ...