Window Fitter Fitness Guide: Protect Your Shoulders and Stay Strong

Window fitting and glazing work looks straightforward from the outside — fit the frame, put the glass in, done. But spend a day doing it and you understand what it actually demands of the body. You're carrying heavy glass panels in awkward grips, holding frames at overhead angles for extended periods, bracing against wind resistance, and asking your shoulders and wrists to absorb loads they weren't designed to handle for eight hours straight.

The result is a trade with a disproportionate rate of rotator cuff injuries, wrist tendinitis, and lower back problems. Most of it is preventable. The blokes who last a full career without major surgery are the ones who put in ten minutes of prehab work before or after the job — not because they're gym obsessives, but because they understand the trade is already costing them something physical every day.

The Shoulder Problem: Why Glaziers Get Hurt

The rotator cuff is a group of four small muscles that stabilise the shoulder joint. When you're pressing a window frame into position overhead, or bracing a large glass panel against wind, the rotator cuff is working continuously as a stabiliser — not as a prime mover, just holding everything together under load.

Over time, without targeted strengthening, these small muscles fatigue and the larger, less precise muscles of the shoulder take over. The deltoids and upper traps try to compensate. The result is impingement — the tendons of the rotator cuff getting pinched under the bony structures of the shoulder with every arm raise. Left unaddressed, impingement progresses to partial tears and eventually full ruptures that require surgery and months off the tools.

The fix isn't complicated. It's three exercises done consistently.

Face pulls. Using a cable machine or resistance band at face height, pull the handles toward your face while keeping the elbows high and the hands finishing near your ears. Three sets of 15–20 repetitions. This directly trains the external rotators of the shoulder — the exact muscles glazing work progressively fatigues. Do these before every session or after a long day on the tools.

Band pull-aparts. Hold a light resistance band out in front of you at chest height with straight arms. Pull the band apart until it touches your chest, squeezing the shoulder blades together. Three sets of 15. This strengthens the rear deltoids and mid-traps — the muscles that keep the shoulder blades in the right position under load. Cheap, can be done at home, takes two minutes.

External rotations. With a resistance band or light dumbbell, keep the elbow at 90 degrees and tucked to the side, and rotate the forearm outward. Three sets of 12–15 each side. This is the most direct exercise for the infraspinatus and teres minor — the two rotator cuff muscles most commonly injured in overhead trades.

Wrist and Forearm Health: Carrying Glass All Day

Glass panels are carried with a suction grip — a sustained, high-force isometric contraction of the forearm flexors that has no natural rest point. Over a full day of this, forearm flexor tendons take a significant cumulative load. Add the vibration from power tools and the repetitive wrist movements from frame fitting, and you've got all the ingredients for wrist tendinitis and early-onset repetitive strain.

The primary intervention is eccentric wrist curls. Hold a light dumbbell or resistance band, extend the wrist slowly under load (the eccentric phase), then curl it back up. Three sets of 15. The eccentric loading is what makes this exercise specifically effective for tendinitis — it remodels tendon tissue in a way that concentric-only exercises don't.

Supplement this with daily forearm stretching. Extend one arm with the palm down, use the other hand to pull the fingers downward until you feel a stretch along the top of the forearm. Hold 30 seconds. Switch to palm up, fingers pulled back toward the body, stretching the underside. This keeps the flexor and extensor tendons from shortening over time.

See our tradie wrist pain guide for a full breakdown of the causes and a 5-minute daily wrist care routine.

Core Stability: The Foundation for Overhead Work

Every overhead lift you do as a window fitter transfers force through the trunk. A weak or non-functioning core means the spine is absorbing forces it shouldn't — and over a career, that translates directly to disc problems and lower back pain.

The core training that matters for glaziers isn't crunches or sit-ups. It's anti-rotation and anti-extension work — exercises that teach the core to resist movement under load, which is exactly what it's doing during every install.

Dead bug. Lie on your back, arms pointing toward the ceiling, knees bent at 90 degrees raised in the air. Slowly lower one arm overhead and the opposite leg toward the floor while pressing the lower back into the ground. Return and alternate. Three sets of 10 each side. This directly trains the deep stabilisers — the transverse abdominis — that protect the lumbar spine during overhead loading.

Pallof press. Using a cable or resistance band anchored at chest height, press both hands straight out from the chest and hold for 3 seconds, then return. The body wants to rotate toward the anchor — resisting that rotation is the exercise. Three sets of 10 each side. This trains the anti-rotation function of the core.

Lower Back Protection: Lifting and Bracing

Glass panels are heavy. A standard double-glazed unit for a medium-sized window weighs 25–35kg. You're lifting these from floor level, carrying them, and often fitting them in a bent or rotated position. The lower back takes the load on every rep.

The hip hinge is the non-negotiable movement pattern for window fitters. Every floor-to-install lift should be a hip hinge — hips back, neutral spine, loading the posterior chain rather than rounding the lower back. If you're not doing Romanian deadlifts in the gym, start. Three sets of 10 with moderate weight teaches the body the correct pattern and builds the posterior chain strength that prevents disc injury.

Before a long day of lifts, do a two-minute hip flexor stretch — kneel on one knee, drive the hips forward until you feel the stretch in the front of the kneeling hip. The hip flexors shorten from repeatedly bending forward to pick up panels, and tight hip flexors pull the pelvis forward and increase lumbar load.

On-Site Nutrition: Fuelling Muscle Repair

Window fitting is harder on soft tissue than most trades. Every day involves micro-trauma to tendons, ligaments, and muscle fibres. Protein is the raw material for repair — and most tradies are eating less than half of what they need.

Target 1.6–2g of protein per kilogram of bodyweight per day. For a 90kg bloke, that's 144–180g. Hit this consistently and the micro-damage from daily tool work repairs overnight. Fall short and it accumulates.

High-protein lunchbox staples that work on site: chicken thigh wraps, Greek yogurt, hard-boiled eggs, tinned tuna, and beef jerky. None of these need reheating and all travel well. Two of these at lunch alongside a standard meal gets you to 50–60g at midday, which is the target.

Anti-inflammatory foods are a genuine performance tool for glaziers. Chronic low-grade inflammation — the kind that comes from daily repetitive loading — is addressed directly by omega-3 fatty acids (oily fish, walnuts, flaxseed) and the polyphenols in dark berries, dark chocolate, and green tea. This isn't supplement marketing; the evidence for omega-3s reducing tendinopathy symptoms is solid.

The Bottom Line for Window Fitters

The trade will cost you something physical every day. That's the nature of the job. The question is whether you're managing that cost actively or letting it accumulate into something that ends your career.

Ten minutes of shoulder prehab, a high-protein diet, and lifting with a proper hip hinge are the three habits that separate the glaziers who reach 55 in good shape from the ones who don't. None of it is complicated. All of it works.

See our plasterer fitness guide — another overhead trade with almost identical shoulder demands — for more on the face pull and external rotation protocol.