Brick Workouts for Triathlon: A Beginner's Guide to Running Off the Bike

You rack your bike. You pull on your shoes. You start running.

And for the first few hundred metres, your legs feel like they belong to a completely different person. Heavy. Clumsy. Almost funny, if you weren't trying to race.

Sound familiar? You're not doing anything wrong. That's just what running off the bike feels like when your body isn't used to it yet.

The fix is simpler than most athletes think: brick workouts. Bike, then run, back to back. Do that consistently and race day stops feeling like a surprise.

Here's what bricks actually are, why they work, and how to fit them into a real life schedule (yes, even with work, kids, and a packed week).

What Is a Brick Workout?

A brick is two disciplines stacked together with little or no break. In triathlon, that's almost always bike, then run. Early season, swim-to-bike bricks can help too. But the run off the bike is the one that gets people.

Why "brick"? Because that's what your legs feel like when you start running.

On race day, nobody hands you a gentle warm-up between the bike and the run. You go. Brick training gets you used to that feeling before it counts.

Why Bricks Actually Matter

Cycling and running use a lot of the same muscles, just in different ways. On the bike, your quads and glutes do most of the work while you're sitting down, turning the same motion over and over. Then you stand up to run and everything has to switch. Fast. While tired.

Bricks help with four things:

Your legs learn the switch. The first minute off the bike is weird. The tenth time? Less weird.
You learn pacing. Your legs can feel okay for 200 metres. That's a trap. Bricks teach you to hold back early.
You test race nutrition. Something that sits fine on the bike might not feel great once you're running.
You build confidence. If you've run off the bike in training, you're less likely to panic on race day.

Sprint and Olympic athletes feel this most because the run comes soon after a hard bike. Long-course athletes still need bricks, but you're practising running on tired legs, not copying a full 112-mile ride in training.

3 Brick Sessions to Try

You don't need a monster session to get the benefit. Start small. Build from there.

1. The Short Intro (Beginner)

Bike: 45 to 60 minutes, easy to moderate
Run: 10 to 15 minutes, easy

Focus on the routine: get off the bike, change shoes, start running. Don't worry about pace for the first few minutes. Walk the first minute if you need to. That's fine. You're learning the transition, not trying to win a workout.

2. The Race-Pace Brick (Intermediate)

Bike: 20 minutes easy, then 3 x 8 minutes at race effort (2 min easy between)
Run: 3 x 6 minutes at race pace (2 min easy jog between)

This one shows you what race effort feels like on tired legs. The first run rep will probably feel the worst. By the third, you'll usually settle into something more sustainable.

3. The Long-Course Brick (Advanced)

Bike: 90 to 120 minutes steady, last 20 at race effort
Run: 20 to 30 minutes, building from easy to race pace

Use this once every 2 to 3 weeks in a build phase. It's a big session. Recover properly and keep the next day light.

How Often Should You Brick?

For most age-group athletes, one brick every 7 to 10 days is plenty during a build. Some experienced athletes can handle two a week. More isn't always better.

How do you know if you're overdoing it?

Your normal runs start feeling flat
Your legs stay heavy for days after each brick
Little niggles show up in calves, knees, or hips

Think of bricks as seasoning. Your base fitness still comes from regular swims, bikes, and runs on their own.

No Time? You Still Have Options

Not everyone has a free Saturday for a 3-hour session. That's normal. Here are ways to make bricks work anyway:

Trainer brick: 45 minutes on the turbo, then a 15-minute run. Totally counts.
Commute brick: Ride to a park or trail, lock the bike, run, ride home.
Split brick: Can't go straight from bike to run? Keep both on the same day with under 30 minutes between. Not perfect, but still useful.
Short and weekly: 30 minutes on the bike plus 10 minutes running every week beats one huge session a month that you keep putting off.

The athletes who improve aren't always the ones with the most free time. They're the ones who repeat the right sessions, week after week.

Mistakes I See All the Time

Starting the run too fast. Let your breathing settle before you push.
Skipping bricks until race week. Give yourself at least 4 to 6 weeks of practice before your A race.
Making every brick brutal. Easy bricks build familiarity. Hard bricks build race specificity. You need both, just not every single time.
Forgetting transitions. Practise your shoes, socks, hat, and nutrition setup a few times. It matters on race day.

Quick Answers

Should I eat during a brick?

If the bike part is over 75 minutes, practise what you plan to eat on race day. Take a few bites in the last 10 minutes of the bike so you're not starting the run on empty.

Do I need tri shoes or can I use running shoes?

Running shoes are fine for training. If you race in elastic laces or tri-specific shoes, practise in those at least a few times before the big day.

What if my legs never feel good off the bike?

They might never feel fresh. That's normal. The goal is manageable, not magical. If you still dread every brick after six weeks, look at your bike fit, run volume, and recovery. A coach can help you figure out if it's load, technique, or both.

Make It Fit Your Week

Bricks are one piece of a good triathlon plan. The hard part is putting them on the right day, at the right effort, without wrecking the sessions around them.

That's where a plan that actually adapts to your life helps. RacePal builds training around your schedule, fitness, and goals, so brick sessions land when you can recover from them, not just when a generic template says so.

Try one short brick this week. Your race-day legs will notice.