Brick Run (Bike-to-Run)

A brick run is simply a run you do right after a bike ride. It trains your body to switch from pedaling to running while your legs are already tired, building fitness in your quads, hamstrings, calves, and glutes while your core and hip flexors work to keep you upright and moving.

Finish your bike segment, dismount safely, and get into your running gear without lingering. Stand tall, relax your shoulders, and look forward. Start with short, quick steps rather than long strides.

Begin running as soon as you are ready after the bike. Keep your feet turning over quickly, land under your hips, and avoid reaching out with your front foot. Let your stride lengthen naturally as your legs wake up, and finish the planned distance or time at a controlled effort.

Breathe in a steady rhythm and keep your midsection lightly braced so you do not slouch as you fatigue. To make it easier, walk the first minute or extend your transition time. To make it harder, shorten the transition or hold a stronger effort once your running rhythm settles. Because this session stacks bike and run fatigue, count it against your weekly quality budget.

Fault: Standing around too long after the bike. Fix: Start the run immediately off the bike - that quick transition is the whole point of the drill.

Fault: Trying to hold your normal fresh-run pace with heavy legs. Fix: Expect jelly legs; shorten your stride and lift your cadence, then let the pace settle as your running legs come back.

Fault: Making every brick run a hard effort right from the start. Fix: Progress from short and easy in your base phase to race-pace work in your build phase, and keep off-the-bike pace targets slower than your fresh threshold pace.

Fault: Overstriding and landing on your heels because your hips are tight from cycling. Fix: Take short, quick steps, land under your center of mass, and stay tall through your torso.