Brick Workouts: The Key to Triathlon Performance

What Is a Brick Workout?

A brick workout combines two disciplines back-to-back, typically cycling immediately followed by running. The name comes from how your legs feel — like bricks — when you start running after a hard bike.

This feeling isn’t just mental. When you cycle, blood flows to your quadriceps and hip flexors in a specific pattern. When you switch to running, your body needs to redirect blood flow, activate different muscle groups, and adjust to impact forces. That transition takes 5–15 minutes. Brick training shortens it.

Why Bricks Are Non-Negotiable

Every triathlete remembers their first bike-to-run transition. Your legs don’t feel like your own. Your stride is awkward. Your pace is 30–60 seconds per km slower than normal. Some athletes describe it as “running through mud.”

Without brick training, this effect lasts the entire run leg. With regular brick practice, your body adapts — the transition period shrinks from 15 minutes to 3–5 minutes, and your run performance off the bike improves dramatically.

The data: Athletes who include weekly bricks in their Build and Peak phases run 3–8% faster off the bike than those who train each discipline separately.

Brick Workout Library

Sprint Distance Bricks

The Intro Brick (beginner)

Bike: 30 min easy
Run: 10 min easy
Focus: Just experience the transition. Don’t worry about pace.

The Sprint Rehearsal

Bike: 20 min at race effort
Run: 5 min at race effort → 5 min easy
Focus: Practice race-day pacing

Olympic Distance Bricks

The Tempo Brick

Bike: 45 min with 3×5 min at race effort
Run: 20 min at race pace
Focus: Running well on tired legs

The Extended Brick

Bike: 60 min at tempo
Run: 30 min at marathon pace
Focus: Endurance under fatigue

70.3 Bricks

The Half-Distance Staple

Bike: 90 min at race effort
Run: 30 min at target half-marathon pace
Focus: Practice nutrition and pacing

The Progressive Brick

Bike: 2h at race effort
Run: 40 min, building from easy to race pace over the last 15 min
Focus: Finishing strong

Ironman Bricks

The Long Brick

Bike: 3–4h at race effort
Run: 45–60 min at Ironman marathon pace
Focus: Race simulation, nutrition rehearsal

The Race-Week Sharpener

Bike: 45 min easy with 3×2 min at race effort
Run: 15 min with 3×1 min at race pace
Focus: Feel good, stay sharp, don’t fatigue

How to Structure Bricks in Your Plan

Frequency

Base phase: 1 brick every 2 weeks (short, easy)
Build phase: 1 brick per week (increasing duration and specificity)
Peak phase: 1 brick per week (longest sessions, race simulation)
Taper: 1 short, sharp brick 7–10 days before race

Timing

Saturday is the classic brick day — long bike in the morning, run immediately after. This gives you Sunday for recovery (or a long easy run if your plan calls for it).

The Transition Practice

Use brick workouts to practice T2:

Finish your ride, park your bike
Remove cycling shoes, helmet
Put on running shoes (elastic laces!)
Grab your nutrition
Start running

Time yourself. Your goal: under 90 seconds for the full T2 process.

Common Brick Mistakes

Going too hard on the bike — The run portion should be at your target race pace, not survival mode. If you can’t run at your target pace, you biked too hard.
Skipping the run when tired — The whole point is running on tired legs. Even 10 minutes of shuffling has training value.
Not eating during the bike — Practice race nutrition. Your run performance depends on what you consumed on the bike.
Doing bricks every day — They’re demanding. One per week is enough. More than that increases injury risk.
Only doing long bricks — Short, intense bricks (20 min bike + 10 min run) build neuromuscular adaptation efficiently. Not every brick needs to be an epic.