You signed up for a running race with some lifting in between. Your shoulders signed up for something else entirely. Over 60 to 90 minutes of continuous stabilizing, pulling, pressing, catching, and absorbing — just when the body is at its most depleted, 100 wall balls. The one the research flags as the highest rate of perceived exertion and lactate response in the entire race.

In this episode, Mark Lusk breaks down exactly what Hyrox demands from your shoulders, why they break down when they do, and what to do about it — with specific attention to the 40 to 65+ athlete, now the fastest growing demographic in Hyrox worldwide. Mark demystifies the three most common shoulder patterns he sees in the clinic from Hyrox athletes — rotator cuff overload, biceps tendon irritation, and AC joint irritation — and reveals the real villain behind all of them: not weakness, but trunk fatigue. Then he delivers a five-tool Burn Toolkit with a practical prehab routine you can plug into your training this week.

• Hyrox is a shoulder endurance test, not a max strength test.
• Wall balls are one of the hardest stations because they come when the body is already depleted.
• The most common Hyrox shoulder issues are rotator cuff overload, biceps tendon irritation, and AC joint irritation.
• Shoulder pain often starts when the trunk stops stabilizing.
• Smart prep includes shoulder endurance, scapular control, posterior chain work, core stability, and gradual volume progression.
• Pain up to 3/10 that resolves within 24 hours can be acceptable, but anything beyond that is feedback you should not ignore.

• The bold assumption athletes make about their shoulders going into Hyrox
• Why the 40–65+ demographic needs this episode specifically
• What today's episode covers: demands, breakdowns, anatomy, research, and prehab
• The actual itinerary your shoulders signed up for — all 8 stations
• Wall balls: why the research flags this as the highest exertion moment in the race
• Why Hyrox is an endurance test, not a strength test — and what that means for 40+ athletes
• What the functional fitness research says about shoulder injury rates
• Pattern #1: Rotator cuff overload and what "impingement" actually means
• Pattern #2: Biceps tendon irritation and upstream control loss
• Pattern #3: AC joint irritation and how it develops
• The real villain — trunk fatigue and what it does to the shoulder system
• The Burn Toolkit: 5 actionable shifts for your Hyrox training
• Tool #1: Train shoulder endurance, not ego strength
• Tool #2: Prioritize scapular control
• Tool #3: Strengthen the posterior chain
• Tool #4: Protect your core — the most misunderstood piece
• Tool #5: Respect volume like a professional
• The pain framework: what's acceptable and what's data
• Race strategy summary and closing thoughts

• MVMT Physical Therapy: www.mvmtpt.com
• Social: @MVMTPT

• Hyrox athletes aged 40–65+ preparing for their first or next race
• CrossFit and functional fitness athletes dealing with recurring shoulder issues
• Anyone who has ever hit wall ball rep 80 and felt something go wrong
• Athletes who train hard but have never specifically trained shoulder endurance under fatigue