If you're looking for a great workout to train your posterior chain, there's no better option than the ITY. Chances are you're more familiar with the arm movements that come with spelling out the YMCA than you are with the ITY, but there's a reason to incorporate the latter letters into your routine. While both can give your upper body a workout [1], only one won't have people looking at you sideways in the gym.

"The ITY is a compound movement targeting your upper back and shoulders," says Michael Betts, CPT. "Named for the shapes your arms make during each phase, this exercise strengthens the often-neglected posterior chain muscles vital for posture and shoulder health."

Ahead, your guide to ITYs, including the benefits, how to do them, and common mistakes to avoid.

Experts Featured in This Article:

Michael Betts [2], CPT, is a director at TrainFitness [3], a UK-based fitness platform and training program.

Benefits of ITY Shoulder Exercises

ITYs (also called IYTs) are specifically good for those of us who are victims of "text neck," and let's face it, who isn't these days? "ITYs build strength in the posterior chain, which is quite commonly neglected," Betts says. "This translates to better posture [4], reduced shoulder pain, and enhanced stability for pushing and pulling movements. The exercise helps counteract the forward-rolled shoulder position many develop from desk work or phone use."

How to Do ITYs

Lie face down on a bench or mat. Begin with your arms hanging straight down toward the floor. For each position, maintain a slight bend in the elbows and squeeze your shoulder blades together:

• I Position: Raise your arms straight up alongside your ears. Think about reaching your fingertips to the wall in front of you. Hold for two seconds, then lower.
• T Position: Raise your arms out to the sides, parallel with the floor. Keep palms facing down. Hold for two seconds, then lower.
• Y Position: Position arms at 45-degree angles to form a "Y" shape. Keep thumbs pointing up toward the ceiling. Hold for two seconds, then lower.

While this move can be done with light 2 lb. or 3 lb. dumbbells like these PS Neoprene Dumbbells [5] ($7), it's best to perfect the move first using your bodyweight before adding any additional weights to the movement.

Muscles Worked

ITYs are an exercise that target your upper posterior chain, which includes several of the muscles in your upper back. Here's what areas you'll be targeting with ITYs:

• Trapezius: runs from the upper back to the neck and stabilizes the shoulder blade.
• Rhomboids: upper back muscles that help with shoulder stability and movement.
• Rear deltoids: located on the back of the shoulders and stabilizes the shoulder joint to help with pulling motions.
• Rotator cuff muscles: a group of muscles that surround your shoulder joint and are responsible for moving the shoulder.
• Serratus anterior: located in the chest and helps to stabilize and move your shoulder blade.

Form Tips for ITYs

Form is a crucial part of any exercise to ensure you're getting the most out of the move. Ahead, Betts shares form tips for ITYs:

• Keep your neck neutral: Look down at the floor rather than lifting your head.
• Use your shoulders: Initiate each rep through your shoulders by firstly squeezing your shoulder blades together and then lifting your arms.
• Control the movement: Make sure you maintain control during the lowering phase of the movement, rather than letting your arms drop.
• Keep your core engaged: You don't want your lower back to arch while performing this movement, so Betts shares that core engagement is essential [6].

Common ITY Mistakes

Because there are many movement patterns in this one exercise, it's important to pay attention to form to protect yourself from injury. Betts points out these common mistakes to avoid.

• Using momentum instead of controlled movement: "When momentum takes over during ITYs, you bypass the key stabilizing muscles these movements target," Betts says. "The posterior deltoids, rhomboids, and lower trapezius need time under tension to strengthen properly. Swinging or bouncing through the movements reduces this critical time under tension and can place unsafe stress on your rotator cuff." Ultimately, the goal is to build endurance and stability in these postural muscles through precise, deliberate movement patterns.
• Lifting your head and creating neck strain: Head position can dramatically impact your form during ITYs. "Lifting your head tilts your cervical spine out of neutral alignment and activates your upper trapezius. This compensation pattern shifts work away from the targeted posterior chain muscles and creates unnecessary tension in your neck," Betts says. As a side effect, you may experience cervical strain and headaches.
• Failing to maintain shoulder blade retraction throughout the movement: "The foundation of ITYs lies in keeping your shoulder blades pulled back and down throughout each phase," Betts says. "When this retraction isn't maintained, the shoulders roll forward and the chest caves in." This can reduce activation of the rhomboids and middle/lower traps while placing excessive strain on the anterior shoulder. "Proper blade positioning creates the stable base needed for strengthening the entire posterior chain," Betts says.
• Rushing through repetitions rather than focusing on muscle engagement: "Speed kills form during ITYs," Betts warns. "Racing through reps prevents proper mind-muscle connection and reduces time under tension." Try to avoid quick, jerky movements as the posterior chain muscles respond best to controlled concentric and eccentric phases [7]. Take two to three seconds up and down for each rep.
• Lifting too heavy: "Start with bodyweight only to master the movement pattern," Betts says. Then, when you're ready to add load, stick to very light dumbbells. Betts suggests no more than 2-3 lbs. "Using heavy weights forces compensation from larger muscle groups and reduces isolation of the posterior chain," Betts says. The key is to focus on perfecting positions rather than moving heavy weight.

Brittany Hammond [8] is a NASM-certified fitness instructor, a fitness writer, and an avid reader. In addition to PS, she has contributed to Livestrong.com, Well+Good, Verywell Fit, and Health.com. She has worked as a group fitness coach for the past seven years.