In triathlon, some workouts have almost become legendary. Among them, the famous brick sessions sit in a league of their own. For many triathletes, they represent the rite of passage into serious training. And yet, their true value is still debated. Do you really need one every week? Are they genuinely effective for performance gains, or are they mainly a mental safety blanket?
Let’s break down a workout that’s as popular as it is sometimes misunderstood.
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What is a brick workout?
A brick workout means stacking two triathlon disciplines back-to-back with no real break, most often cycling followed by running. The main goal is to recreate the T2 transition, and especially that well-known “dead legs” feeling in the first kilometres of the run after the bike.
The word “brick” supposedly comes from that exact sensation, running with legs that feel as heavy as bricks. In its classic format, a brick session might look like:
- 2 hours on the bike followed by 20 to 40 minutes of running;
- shorter repeats like 5 x (10 min bike + 5 min run);
But behind this simple idea sit very different physiological and mental training goals.
Why are brick workouts so popular?
Replicating race-day sensations
The obvious benefit of a brick is to prepare your body to run off the bike. Biomechanically, your stride changes after spending tens of kilometres in a cycling position. Different muscle recruitment, neuromuscular fatigue, and posture changes can all disrupt the first minutes of the run.
Brick sessions can help you:
- train your neuromuscular system to handle the switch
- improve coordination
- pace yourself better right from the moment you leave transition
For beginners, this can prevent going out way too fast on the run, then blowing up a few kilometres later.
A powerful mental tool
Brick workouts also have a strong psychological component. Linking two disciplines creates a “pure triathlon” feel that’s hard to replicate any other way.
These sessions help build confidence, reinforce transition routines, and develop the ability to hold steady effort even when fatigue is already there.
A few weeks out from your target race, they’re also a great way to validate your nutrition strategy or race-day gear.
Specific work for middle and long distance
For middle and long-distance events, bricks make even more sense. Triathlon difficulty is not only about each sport in isolation, it’s about the cumulative load.
In that context, bricks become more of a specific endurance tool than just a bike-to-run transition drill.
But are they really essential?
Despite their popularity, many coaches put their importance into perspective.
The physiological gains can be limited
From a strictly physiological standpoint, the adaptations from a brick workout aren’t necessarily greater than what you can get from well-designed, traditional bike and run sessions.
To improve in triathlon, the biggest drivers are still: overall training volume, workout quality, consistency, and recovery.
In other words, a triathlete who runs well thanks to a structured training plan doesn’t automatically need to stack bricks to perform.
Some research also suggests that the heavy-leg sensation naturally fades with experience and a higher overall training level.
A fatigue cost that’s often underestimated
Brick sessions can also be demanding. If they’re poorly placed in a training plan, they can quickly ramp up muscular and nervous system fatigue. The classic trap is turning every bike ride into a mini triathlon.
For age-group athletes with busy schedules, the benefit-to-fatigue ratio is not always worth it.
Not every triathlete needs them to the same degree
The need depends heavily on your athlete profile.
For a beginner, a few brick workouts before a race can be very useful to discover the transition sensations.
For an experienced athlete, the priority may be elsewhere, such as building bike power, improving running economy, strengthening swim fitness, or optimising recovery.
So doing a brick workout every single week is far from a universal requirement.
How to use brick workouts effectively
Choose quality over quantity
There’s no need to stack bricks all year long. A few well-timed sessions are often enough. For example:
- during your specific build toward a key race
- to test your target race pace
- to rehearse your race nutrition plan
- to practise transitions
Keep it simple
An effective brick workout doesn’t need to be flashy. Sometimes, 15 to 20 minutes of easy running after a bike ride is more than enough to condition your body and dial in the feel.
The goal is not to destroy yourself, it’s to learn how to link disciplines smoothly.
Verdict: essential or overrated?
The truth is probably somewhere in the middle. Brick workouts are neither magic nor useless. They’re an excellent specific training tool when used at the right time, with a clear purpose.
Brick sessions should stay a means to an end, not the end itself.