How to Run Off the Bike: Master Brick Workouts and Lose the Concrete Legs
Picture the moment. You have 90 kilometers in the saddle behind you. The crowd is shouting, adrenaline is rising, you jump off the bike in the T2 transition and put on your running shoes. You head out. And then it hits you.
The feeling that you have someone else’s heavy pillars where your legs used to be. Your pace drops, your heart rate shoots up, and you fight for every step. Triathletes call this “concrete legs” or “running in mud.”
As an IRONMAN Certified Coach, I’ll tell you one hard truth: this isn’t just “poor fitness.” It’s a mistake in strategy and physiological preparation.
Why Does Your Body Go on Strike in T2?
When new clients come to me at Atte ACADEMY, they often describe how they “feel strong” in training but “blow up” on the run in a race. The reason is often neuromuscular and hemodynamic.
Blood is elsewhere: In cycling, blood flows primarily to your quadriceps (thighs). In running, you suddenly need it in your calves and hamstrings. If your body isn’t adapted to this “switch,” it can feel like circulation can’t keep up.
A change in contraction type: Cycling is about concentric force (you push). Running is about eccentric load (you land and brake your body weight). After hours in the aero position, your muscles are shortened and ready to push, not to absorb impact.
What the Forums Say vs. What an IRONMAN Coach Tells You
If you google it, you’ll find the advice: “Do brick workouts (run right after the bike).” That’s like telling a chef: “Use salt.” Yes, but how much?
As a coach, I see two fatal mistakes in amateurs:
Mistake #1: Bricks that are too frequent. If you do a hard transition workout every week, you raise the risk of overuse injuries such as stress fractures or tendon inflammation. Back off if you feel pain, and see a professional if it persists.
Mistake #2: Ignoring cadence. Many athletes “grind” big gears all the way to the transition.
My Strategy for Atte ACADEMY Clients
When I build a training plan, we work with data. Here’s how to outsmart your physiology:
1. Raise Your Cadence Before the Transition
For the last 2-3 kilometers on the bike, you need to change your rhythm. Shift to an easier gear and raise your cadence to 95+ rpm. This neurologically “wakes up” your legs for the running turnover. I write about the importance of spinning your legs in the article on cycling cadence.
2. The First 10 Minutes of the Run: Ignore Pace
When you run out of the transition, your sense of speed is distorted (everything feels slow after the bike). Most people burn their matches too early. I tell my athletes: “Run the first kilometer by feel, below your ability.” Watch your heart rate, not your pace. Stay in Zone 2 until your circulation settles.
3. Step Frequency
Try to take small, quick steps. Don’t try to take long leaps (overstriding), that can wear you out quickly.
Why Do You Need Individual Coaching?
You can read ten articles about brick workouts, but no article knows your injury history and your work schedule.
As your coach, I need to know exactly:
What is your lactate threshold on the bike? (See the article on FTP and data.)
How quickly does your heart rate recover after effort?
Without those answers, your training is just guessing. And you don’t leave an Ironman to chance.
Stop Experimenting With Your Health
The transition can be trained so that you actually look forward to the run. Let me take responsibility for your preparation.
Book a consultation and a training plan at Atte ACADEMY. I’ll help you prepare so that at the finish line you’re not just a “finisher,” but an athlete who enjoyed the race in good health.