A brick does not have one required duration, intensity, or weekly frequency. A first bike-to-run brick may pair an easy 45-60 minute ride with 8-12 minutes of easy running or run-walk. Later race-specific bricks can rehearse bike pacing, kit, fuelling, and the opening run plan. The run still counts as impact load, and longer is not automatically more specific. Research often finds that cycling makes a subsequent run harder, but athlete responses and proposed mechanisms vary.
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