LOOK 10 YEARS YOUNGER WITH STRONG RHOMBOIDS
As you age there is a tendency to hunch over. This immediately age your appearance.
Posture and body alignment is the key to a youthful appearance and injury prevention.
Tight pectoral muscles across the chest and stretched, lax muscles across the back create a hunched profile. It's not good enough to say "pull your shoulders back" or "stand up straight" as you mother might have told you.
What she should have been saying is
"Tuck Your Shoulder Blades Down and Back"
By sliding your shoulder blades down and back before an exercise - like you're tucking them into your back pockets -- can improve your results and protect from injury. It helps activate your lats for pulling exercises, work your pecs more completely in pushing exercises, keeps your chest up during a squat, and can reduce painful impingement on your rotator cuff during biceps curls.
Practice until it becomes the normal position.