Triathlon is an endurance sport, but that doesn't mean strength is irrelevant.
In fact, one of the biggest changes I've seen in endurance training over the last couple of decades is a better understanding of how strength training can complement, rather than compete with, endurance work.
The objective isn't to spend hours in the gym building maximum muscle mass. It's to make the athlete more robust.
Greater force production.
Better muscular durability.
Improved neuromuscular function.
Greater resistance to fatigue.
Better movement control.
The ability to maintain technique late in training and racing.
Research in endurance cycling suggests that heavy strength training can improve several physiological determinants of endurance performance, although the exact response depends on the athlete and training program.
The key is choosing exercises that give you a strong return without creating unnecessary fatigue.
The squat is one of the most useful foundational exercises for triathletes because it trains the hips, quadriceps, and glutes while requiring full-body control. You don't necessarily need to squat with enormous loads.
Good movement quality.
Controlled depth.
Stable knees.
Strong hip drive.
Gradually increasing resistance.
For an experienced athlete, heavier sets with relatively low repetitions can work well. A newer athlete may benefit more from learning the movement properly before worrying about load.
Running and cycling are predominantly performed one leg at a time, so unilateral strength deserves a place in any sensible triathlon strength workout.
Single-leg strength.
Hip stability.
Balance.
Glute strength.
Control through the knee and ankle.
They also expose differences between your left and right sides that bilateral exercises can sometimes hide.
If you only have limited gym time, I'd rather see an athlete perform a good split squat consistently than spend half an hour moving from machine to machine.
The Romanian deadlift targets the posterior chain, particularly the hamstrings and glutes. This is important for triathletes because those muscles contribute significantly to running and cycling performance.
Start tall with the weight close to your body.
Push your hips backward.
Keep your spine controlled.
Lower until you feel a strong hamstring stretch.
Drive your hips forward to return to the starting position.
You don't need to chase maximum weight. The goal is quality movement under progressively increasing resistance.
Walking lunges are another excellent unilateral exercise and can be particularly useful for runners. They challenge the quads, glutes, and hamstrings while requiring you to control your body through a moving single-leg position.
For triathletes, I like them because they are simple, require relatively little equipment, and transfer well to the demands of running. Start with bodyweight if necessary, then introduce dumbbells when your technique is solid.
Don't overlook your calves. The calf complex plays an important role in running, and strengthening it can help you repeatedly absorb and produce force.
Standing with both legs.
Single-leg.
With dumbbells.
Using a dedicated machine.
With a straight or bent knee to change the emphasis.
Progressively loading the calves is far more useful than simply performing hundreds of unweighted repetitions.
Strength training for triathletes shouldn't be entirely about the legs. Swimming places substantial demands on the upper body, while maintaining good posture on the bike and during running also requires upper-body and trunk strength.
Rows are a particularly useful option because they train the upper back while reinforcing controlled shoulder movement.
Dumbbells.
Cables.
Resistance bands.
A barbell.
Bodyweight variations.
Choose the option that allows you to perform the movement well.
Loaded carries are one of my favorite exercises for athletes because they combine strength, grip, posture, and trunk stability in a very simple movement.
Farmer's carries are particularly useful. Pick up a challenging but manageable load, stand tall, and walk under control.
Tall posture.
Controlled breathing.
Stable shoulders.
A strong core
Controlled steps.
They're simple, but don't mistake simple for easy.
Triathletes don't need endless sets of crunches.
I'd rather see athletes develop the ability to resist movement and maintain a strong position while producing force.
Planks.
Side planks.
Dead bugs.
Pallof presses.
Loaded carries.
Bird dogs.
The goal is to develop a trunk that supports arm and leg movement rather than becoming a separate fitness challenge.
For many triathletes, two strength sessions per week can be highly effective, especially when endurance training volume is manageable.
During heavier race-specific phases, one session may be enough to maintain strength.
|
Exercise |
Sets |
Reps |
|
Squa |
3 |
5-8 |
|
Split squat |
3 |
6-10 each leg |
|
Romanian deadlift |
3 |
6-8 |
|
Calf raise |
3 |
8-15 |
|
Row |
3 |
8-12 |
|
Farmers carry |
3 |
30-60 sec |
You don't need to copy these numbers exactly. Training age, experience, and the rest of your triathlon program should determine the workload.
This is the biggest mistake I see. Strength training should support your triathlon program, not become another source of fatigue that compromises swimming, cycling, and running.
That means avoiding the temptation to turn every gym session into a competition. Leave the gym feeling like you've done useful work, not like you need three days to recover.
And remember that recovery is part of the equation. After particularly demanding blocks, tools such as the SLS3 Compression Recovery Boots can be a useful additional recovery strategy, alongside sleep, nutrition, and sensible training management.
You don't need to become stronger simply for the sake of being stronger. The goal is to become a better triathlete.
Maintain technique when fatigued.
Produce force efficiently.
Handle training volume.
Stay durable across the season.
Finish the run with better form.
Your strength program should also evolve with your endurance program. During a base phase, you may have more room for gym work. As competition approaches, the priority shifts to maintaining strength while letting your swim, bike, and run sessions take center stage.
If you're combining strength work with brick sessions, our guide to Brick Workouts for Triathletes explains how to combine cycling and running effectively.
And for long training days, comfortable kit matters too. Our SL3S Tri-suit collections are designed for triathlon training and racing, with the flexibility of separate shorts.
