What Is Brick Training? Definition, Benefits & Workouts
A brick workout is any training session that combines two triathlon disciplines back-to-back, most commonly a bike ride followed immediately by a run. The name comes from the heavy, "brick-like" feeling in your legs when you start running after cycling — and from the Bike-Run-ICK acronym some coaches use. Brick training is essential preparation for race day.
Why Is It Called a Brick Workout?
Two explanations are commonly cited:
- The sensation explanation: Your legs feel like bricks when you step off the bike and start running. The heavy, unresponsive feeling in the quads and hamstrings — caused by blood pooling in cycling-specific muscles — is distinctive enough that triathletes named it.
- The acronym explanation: Bike-Run-ICK. Less flattering, equally accurate.
- The name origin: Some attribute it to New Zealand triathlete Matt Brick, who popularised the training method in the 1980s, though this is debated.
Regardless of origin, the term is universally recognised: if someone says "I have a brick tomorrow," they mean a multi-discipline session, almost always bike then run.
Why Brick Training Matters
Running off the bike is physiologically different from fresh running. Your body needs to be trained to make the switch. Here's what happens without brick training:
Without brick training
- Legs feel heavy for 10–20 minutes
- Running form breaks down early
- Pace drops dramatically off target
- Mental shock of the transition compounds physical issues
With regular brick training
- Adaptation time drops to 3–5 minutes
- Running form holds through the heavy feeling
- Muscle recruitment patterns adapt
- Confident execution on race day
The physiological reason: cycling primarily uses the quads in a pushing motion. Running requires the hamstrings, glutes, and hip flexors to fire in a different pattern. After extended cycling, blood and neural activation are concentrated in cycling muscles. Brick training teaches your neuromuscular system to switch faster.
7 Brick Workouts by Distance & Goal
| Workout | Bike | Run | Goal | Best for |
|---|---|---|---|---|
| First brick | 30 min easy | 10 min easy | Experience the T2 feeling | Beginners |
| Sprint prep | 45 min mod | 15–20 min mod | Sprint race simulation | Sprint athletes |
| Olympic brick | 60–75 min mod | 20–30 min at race pace | Simulate Olympic T2 | Olympic athletes |
| Intensity brick | 45 min with 3×10 min at threshold | 20 min at race pace | Run fast off a hard bike | Sprint/Olympic |
| Half iron brick | 2–2.5 hrs at race effort | 30–45 min at goal pace | 70.3 race confidence | Half Ironman athletes |
| Ironman brick | 4–5 hrs at race effort | 45–60 min | Race day simulation | Full Ironman athletes |
| Multi-brick | 30 min × 2 sets | 10 min after each bike | Rapid T2 adaptation | All levels |
How to Structure Brick Training in Your Plan
How many bricks per week?
One brick workout per week is sufficient for most athletes. Two is common in peak training weeks before a Half or Full Ironman. More than two per week increases injury risk without proportional benefit.
When in the training cycle?
Begin brick workouts 8–12 weeks before your race. Start with shorter run legs (10–15 minutes) and extend gradually. The final 4 weeks before race day should include at least one brick that closely simulates race distance and intensity.
Transition practice
Use bricks to practice your T2 setup. Rack your bike, change shoes, and run — treating the brick like a real transition. This builds muscle memory and surfaces equipment issues before race day.
Recovery
Brick workouts are high-stress sessions. Plan an easy or rest day immediately after. Nutrition in the 30-minute window post-brick is critical: 3:1 carbs-to-protein, 500–700ml fluid.
Do Swim-Bike Bricks Exist?
Yes — swim-bike bricks are less common but valid. They practice the T1 transition and are useful for athletes who struggle with dizziness or disorientation coming out of the swim into cycling.
A typical swim-bike brick: 1,500–2,000m open water or pool swim, then mount and ride 30–45 minutes at moderate pace. The goal is confirming your body can handle the blood-flow shift from horizontal swimming to upright cycling.
Swim-run bricks also exist (rare) and are used in SwimRun-specific race preparation, not standard triathlon training.
The single most effective thing you can do for your triathlon run leg is consistent brick training starting 8–10 weeks before race day. One brick per week is enough. What matters is doing them regularly so your body learns the switch.
Try a calculator
- Sweat Rate Calculator
Measure fluid loss during brick sessions.
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