Why Your Shoulder Surgeon Doesn't Want You to Skip Leg Day

C. Lucas Myerson, MD · Shoulder & Elbow Surgery. · Lenox Hill Hospital

What happens in your legs doesn't stay in your legs — and if you're heading into shoulder surgery, or trying to avoid it, this matters more than most people realize.

Every week I see patients in clinic who have spent years training their chest, shoulders, and arms, and comparatively little time on their lower body. They're often surprised when I tell them that their leg training (or lack of it) is relevant to why their shoulder hurts, or to how well they'll recover after surgery. But the connection is real and it's backed by evidence.

This post covers four things: how muscular imbalance from upper-body-dominant training creates risk of shoulder injury, how leg strength connects to the shoulder through the kinetic chain, why continuing to train your lower body during recovery is not just permitted but encouraged, and why strong legs matter for your safety when your arm is in a sling.

01 The Problem

The Upper Body Only Trap Is Hurting Your Rotator Cuff

Most gym programs are front-loaded. Bench press, overhead press, cable crossovers, lateral raises. These movements dominate the typical training week. The problem isn't the exercises themselves. The problem is the ratio.

The shoulder functions as a system of opposing force couples. The internal rotators, primarily the pec major, anterior deltoid, and subscapularis, are large, powerful muscles that dominate most pressing and overhead movements. The external rotators like the infraspinatus, teres minor, and posterior deltoid are smaller, often undertrained, and responsible for decelerating the arm and stabilizing the humeral head in the glenoid.

When internal rotators chronically overpower external rotators, you create a muscular imbalance at the glenohumeral joint. This imbalance is a primary risk factor for rotator cuff injury in overhead athletes and by extension, in anyone whose training systematically develops one side of this equation while neglecting the other.

The fix isn't to stop bench pressing. It's to train the posterior chain of the shoulder with the same intentionality you apply to the anterior chain. External rotation work, face pulls, rear delt training, and scapular stabilization exercises are not accessories. They're structural. And this is before we even get to the legs.

02 The Kinetic Chain

Weak Legs Mean Your Shoulder Absorbs More

Here's the part most gym-goers haven't considered: your shoulder doesn't generate force in isolation. In virtually every athletic movement — throwing, serving, swinging, pressing overhead — force begins at the ground, travels up through the lower body, through the core and trunk, and terminates at the upper extremity. This is the kinetic chain.

When each segment of that chain is strong and mobile, energy transfers efficiently. When a link is weak, the segments distal to that deficit compensate. In practice, this means that lower extremity weakness (i.e. in the hips, glutes, quads, or ankles) forces the shoulder and elbow to absorb loads they were never designed to handle independently.

A 20% reduction in energy production from the trunk increases the load on the throwing shoulder by up to 34% to maintain the same performance output, illustrating how deficits in the lower body and core compound at the shoulder.

This is not a concern limited to pitchers or overhead athletes. It applies to anyone whose training creates chronic asymmetries in the kinetic chain, including patients who train their upper body intensively while neglecting their lower body. Over time, that compensatory overload is how overuse injuries develop, even in people who aren't doing anything obviously wrong at the shoulder itself.

Training the legs, hips, and core is not just about aesthetics or athletic performance. It is structural protection for the rest of your body.

03 Post-Op Recovery

Your Shoulder Is in a Sling. Your Legs Still Work.

After shoulder surgery, most patients will spend four to six weeks in a sling. It's a period that tends to feel like forced inactivity, and for a lot of active people, that can be very difficult. But here's what I want patients to understand: immobilization applies to your shoulder. It does not apply to your entire body.

Lower body training during the sling period is not just permitted, it's encouraged (and there's a physiological rationale for it). Research on exercise-induced pain modulation shows that a single session of lower body exercise triggers your body's built-in pain control system. The proposed mechanisms involve release of endogenous opioids and endocannabinoids, as well as descending pain inhibitory pathways, which results in a measurable reduction in pain sensitivity that is generalized, meaning it occurs not just at the exercising body part but systemically, including at the shoulder.

This is not a reason to push through pain or ignore your surgeon's post-operative restrictions. It is a reason to have an explicit conversation about what lower body training is appropriate in your specific recovery protocol, and to approach the sling period as an opportunity to build the foundation your shoulder will rely on when you return to full activity.

Safe lower-body options during sling immobilization (subject to your surgeon's clearance):

• Stationary bike (upright or recumbent)

• Bodyweight squats and lunges

• Leg press (no upper extremity loading)

• Walking, including inclined treadmill

• Seated calf raises and hip hinge work

  
  

Always discuss your exercise plan with your surgeon before beginning any post-operative activity. The appropriate program varies by procedure, repair quality, tissue condition, and individual recovery trajectory.

04 Safety

A Sling Changes How You Move. Strong Legs Keep You Safe.

There's a practical safety argument for leg strength that doesn't get enough attention in the pre-operative conversation: wearing a sling changes your biomechanics.

The upper extremity contributes to proprioception and postural control in ways we don't consciously register until that input is removed. With one arm immobilized and held across your torso, your center of gravity shifts, your ability to use your arm to catch a stumble disappears, and the demands on your lower extremity and core to compensate increase accordingly. This is particularly relevant on stairs, uneven surfaces, in the dark, or when carrying objects with your free hand.

The pre-operative period, however long or short, is an opportunity to build a foundation. Patients who arrive at surgery with strong, conditioned lower extremities are better protected during the sling phase and typically have a smoother return to full activity.

The Bottom Line

Your shoulder doesn't exist in isolation, and neither does your recovery. The kinetic chain connects your lower body to your upper extremity in ways that are clinically significant and actionable.

If you're training now and want to protect your shoulders long-term: build the posterior chain of the shoulder, and don't neglect your legs, hips, and core. If you're heading into shoulder surgery: show up strong from the waist down, and maintain that strength through your recovery. If you're post-op in a sling: ask your surgeon about lower body training, and use that period purposefully.

Leg day isn't just for bodybuilders. It's structural medicine for your shoulder.

Questions About Training Before or After Shoulder Surgery?

Schedule a consultation: 646-665-6784

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Dr. Myerson is an Assistant Professor of Shoulder & Elbow Surgery at Northwell Health / Lenox Hill Hospital, with clinical locations in Manhattan. If you have questions about your recovery after shoulder surgery, contact our office or visit lucasmyersonmd.com.

The information in this post is intended for general educational purposes and does not constitute individualized medical advice. Always follow the specific instructions provided by your surgical team.

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