Blog 3: Everything Triathlon
Part 3: Building Your Triathlon Body: The Work That Keeps You Racing
Welcome back to Everything Triathlon. Parts 1 and Part 2 covered why triathlon creates a unique injury environment and the specific injuries most likely to derail your season. Now the practical piece, what to actually do about it. The strength, mobility, and preparation habits that keep triathletes healthy, consistent, and improving.
Most triathletes are time-crunched. Three disciplines, a life, a job, possibly a family. Adding more to the schedule is a hard sell. So let me be direct: the work in this post is not optional extra credit. It's what makes the three-discipline training sustainable. Without it, you're just accumulating load on an unprotected system. It truly is the 4TH SPORT of a triathlon!!!
Strength Priorities for Triathletes:
The goal of strength training in triathlon is not performance in the gym — it's tissue protection and movement quality across all three disciplines. Two sessions per week is enough. Here's where to focus:
Glutes and Hip Stabilizers:
The most important strength target in triathlon, full stop. Weak glutes are the common thread behind IT band syndrome, runner's knee, lower back pain, and poor run economy after the bike. Hip thrusts, single-leg deadlifts, lateral band walks, and clamshells. Do these consistently and you will feel the difference on the run. Weak glutes are almost always a problem in triathletes (and other endurance athletes) I see in my practice.
Single-Leg Stability:
Running is a single-leg sport performed in a fatigued state. Single-leg squats, step-ups, and Bulgarian split squats train the stability that holds your run mechanics together when everything else is depleted.
Rotator Cuff Endurance:
Not strength in the traditional sense, but the ability to maintain activation across a long swim. Banded external/internal rotation, prone Y's and T's, and side-lying external rotation. Two sets, twice per week, consistently.
Anti-Rotation Core:
The core's job across all three disciplines is to resist unwanted movement and transfer force efficiently. Dead bugs, Bird dogs, Pallof press, and plank variations with movement are more relevant than any crunch-based exercise.
Calf and Achilles Loading:
Eccentric calf raises are one of the most evidence-backed exercises for Achilles tendinopathy prevention. Single-leg, slow eccentric, off a step. Two sets before every run is enough to build meaningful tissue resilience over a season.
The Non-Negotiable Mobility Targets
These are the ranges of motion that directly protect you in triathlon. If your restricted in any of these then compensation begins immediately:
Hip Flexor Length:
The single most important mobility target for triathletes. Two to four hours on the bike shortens the hip flexors chronically. When they can't fully lengthen in the run stride, the pelvis tips forward, the glutes shut off, and the lumbar spine absorbs what the posterior chain should be handling. Couch stretch and kneeling hip flexor mobilization daily.
Thoracic Rotation and Extension:
Essential for swim mechanics (body rotation in freestyle) and bike posture (preventing lumbar compensation). Cat/Camel and thread the needle rotations are your baseline at least 3x/week.
Shoulder Internal and External Rotation:
The rotator cuff needs full, pain-free rotation to swim efficiently. Posterior capsule tightness from high swim volume reduces internal rotation and creates impingement risk. Sleeper stretch and cross-body stretch after every swim.
Ankle Dorsiflexion:
Affects running mechanics and ground contact quality. Restricted ankles change foot strike, increase Achilles load, and drive compensatory knee and hip movement. Calf stretching and ankle mobility drills take three minutes and pay significant dividends.
Hip Internal Rotation:
The run and bike both demand this. Restriction drives lumbar compensation and IT band loading. 90/90 hip stretches and side-lying hip rotations address it directly.
Transition-Specific Preparation:
The T1 and T2 transitions are biomechanical events that most athletes never train for. Going from horizontal swimming to upright biking, or from a sustained hip-flexed cycling position to the hip extension demands of running —> these are significant neuromuscular challenges:
Brick sessions are not optional: running off the bike is a skill that needs to be trained. The neuromuscular pattern of the run feels completely different in the first kilometre off the bike, and the only way to adapt is to practise it regularly.
Include short T2 activation work: before your transition run begins, a few hip extension movements (standing kickbacks, quick glute bridges) help fire the posterior chain that was inhibited during the bike. Ten seconds well spent.
Practise your swim-to-bike transition: the dizziness and disorientation of going from horizontal to upright is real, especially in open water and if it is cold. Practising the movement pattern reduces the cardiovascular shock and the mechanical stumble.
Recovery Across Three Disciplines:
Recovery for triathletes is complicated by the fact that an easy day in one sport might overlap with a hard session in another. A few principles that cut through the complexity:
Sleep is the most powerful recovery tool available. 8 hours minimum during heavy training. Non-negotiable. Tissue repair, hormone regulation, and neuromuscular consolidation all happen during sleep and nowhere else.
Nutrition timing matters across all three disciplines: protein within 30–45 minutes (depending on if you are male or female) after any session. Carbohydrate replenishment is especially important after longer or higher-intensity bike and run sessions.
Soft tissue work after the bike: five minutes of hip flexor release and glute activation work after any ride over 90 minutes reduces the carryover tightness that compromises the run in training and in racing.
Tune up session with me! Having your soft tissue, joints and nervous system worked on and calmed down once in a while helps to be sure injuries don’t creep up. I call getting treatment my superpower to train and race harder!
Up Next — Training Smart Across Three Disciplines
The body is being built. Part 4 of Everything Triathlon gets into the training structure itself — how to manage load across three disciplines without burying yourself, how to periodize a triathlon season, and how brick sessions fit into a plan that keeps you healthy from base to race day. See you there.
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Want to know which mobility restrictions and strength gaps are most likely to derail your triathlon season? A movement assessment gives you that answer in one session. Book an assessment at Endurance Therapeutics with Dr. Keirstyn today and let's sort it out!
📍 Endurance Therapeutics | Oakville, Ontario
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