Brick Workout Calculator
Our triathlon calculator computes brick workout instantly. Get accurate stats with historical comparisons and benchmarks.
Reviewed by Sher, Sports Science & Nutrition Specialist
Formula
Adjusted Run Pace = Standalone Pace x (1 + Brick Effect %)
The brick effect slows your run pace by 10-30% depending on fitness level. Beginners experience a 30% slowdown, intermediate 20%, and advanced 10%. Total time includes bike time, transition, and adjusted run time.
Worked Examples
Example 1: Olympic Distance Brick Workout
Problem:20-mile bike at 16 mph followed by 3-mile run at 9:00/mi pace. Intermediate fitness.
Solution:Bike: 20 / 16 = 1:15:00\nTransition: 2:00\nRun (standalone): 3 x 9:00 = 27:00\nBrick effect (20%): adjusted pace = 10:48/mi\nAdjusted run: 3 x 10:48 = 32:24
Result:Total: 1:49:24 | Brick-adjusted run pace: 10:48/mi (+20%)
Example 2: Sprint Distance Brick Session
Problem:10-mile bike at 18 mph, 2-mile run at 8:30/mi. Advanced fitness.
Solution:Bike: 10 / 18 = 33:20\nTransition: 2:00\nRun: 2 x 8:30 = 17:00\nBrick effect (10%): pace = 9:21/mi\nAdjusted run: 2 x 9:21 = 18:42
Result:Total: 54:02 | Only 1:42 slower due to low brick effect
Frequently Asked Questions
What is a brick workout in triathlon training?
A brick workout is a training session that combines two disciplines performed back-to-back, most commonly cycling immediately followed by running. The term may originate from the heavy, brick-like feeling in your legs when transitioning from the bike to the run due to the different muscle recruitment patterns between the two activities. Brick workouts are essential for triathlon preparation because they train your body to perform running with fatigued cycling muscles, simulate race day transitions, and develop the neuromuscular coordination needed to switch between movement patterns efficiently. Most triathlon training plans include one brick workout per week during the build phase of preparation.
How long should a brick workout run be?
The duration of the brick run depends on your race distance, training phase, and fitness level. For sprint triathlon preparation, brick runs of 10 to 20 minutes (1 to 2 miles) are sufficient after a 30 to 45-minute bike ride. Olympic distance training benefits from 20 to 40-minute brick runs (2 to 4 miles) after 60 to 90 minutes of cycling. Half Ironman preparation may include brick runs of 30 to 60 minutes after 2 to 3-hour bike rides. Full Ironman training rarely includes brick runs longer than 45 to 60 minutes because the recovery cost outweighs the training benefit at that duration. The goal is to practice the transition, not to replicate full race distances in training.
How often should I do brick workouts during training?
Most triathlon coaches recommend one brick workout per week during the build phase of training, which typically lasts 8 to 12 weeks before your target race date. During the base phase, one brick every two weeks is sufficient for maintaining transition familiarity without excessive fatigue accumulation. In the final 2 to 3 weeks before race day (the taper period), brick workouts should be shorter and less intense, with the last significant brick occurring 10 to 14 days before the race. Doing more than one brick per week risks overtraining and excessive muscle damage because the back-to-back nature of these sessions creates higher training stress than doing either discipline alone at similar intensities and durations.
What is the brick effect and how does it improve over time?
The brick effect refers to the performance decrease experienced when running immediately after cycling, measured as the percentage difference between your standalone run pace and your post-bike run pace. Untrained athletes may experience a 25 to 35 percent pace reduction during their first brick workouts. With consistent practice over several months, this penalty typically decreases to 10 to 15 percent for intermediate athletes and 5 to 10 percent for experienced triathletes. The improvement comes from neuromuscular adaptation, improved blood flow redistribution between cycling and running muscles, and better metabolic efficiency during the transition. Elite triathletes can run within 3 to 5 percent of their standalone pace immediately after dismounting the bike.
References
Reviewed by Sher, Sports Science & Nutrition Specialist · Editorial policy