The term 'brick' comes from the heavy-legged feeling when running off the bike. Bricks train neuromuscular adaptation, pacing discipline, and mental toughness for the T2 transition. A typical brick: 60-90 minutes at race-pace power on the bike, immediately followed by 15-30 minutes of running starting at target race pace. Start with short run portions and build. Brick frequency: 1-2 per week in the build phase, reducing toward race day.
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