Triathlon Long Training Day: Weekend Brick Design with Long Ride + Short Run

The Core Value of a Long Training Day

In the triathlon training system, the “Big Training Day” typically refers to the long-distance session scheduled on the weekend—primarily a long ride followed by a Brick run, sometimes including a swim the day before. The value of this type of session lies in:

1. Metabolic adaptation: Prolonged aerobic exercise trains the body to use fat as fuel more efficiently, which is crucial for triathlon events lasting over 2 hours
2. Muscular fatigue resistance: Hours of continuous training condition the muscles to withstand prolonged repeated contractions
3. Transition adaptation: Running after a fatiguing ride simulates the real physiological conditions of racing
4. Nutrition strategy testing: Long sessions are the best opportunity to test fueling strategies such as energy gels, sports drinks, and solid food

Distance Planning for Long Ride + Brick Run

Based on your race goal, the weekend long training day distances are planned as follows:

Intensity Design Principles for the Long Ride

A long ride is not a “casual spin,” but neither should it be all-out intensity. The ideal long ride intensity distribution:

• First segment (first 50% of distance): Easy to moderate aerobic intensity (Zone 1–2, 60–70% max heart rate), for warming up and establishing an aerobic rhythm
• Middle segment (middle 30% of distance): Moderate to moderately high intensity (Zone 2–3, 70–82% max heart rate), simulating the mid-race pace of the bike leg
• Final segment (last 20% of distance): If energy allows, gradually build toward race pace to set up the transition into the Brick run

The “Progressive Acceleration” Structure in a Long Ride

For example, an 80 km long ride design:

• 0–20 km: Easy aerobic (65–70% HRmax)
• 20–60 km: Steady aerobic (72–80% HRmax)
• 60–80 km: Gradually build to 82–85% HRmax, simulating the late-race bike rhythm

Brick Run Design: Running Practice on Tired Legs

Running immediately after dismounting is one of the most valuable parts of the weekend long training day. Key design points for the Brick run:

Distance: 30–50% of the Race Run Distance

The Brick run after a long ride does not need to—and should not—equal the full run leg distance. The goal is to let the body experience the transition, not to complete the full run training volume (that is what dedicated long runs are for):

• Olympic Distance (10 km run): Brick run of 4–6 km
• 70.3 (21 km run): Brick run of 8–12 km

Pace: From Adaptation Pace to Target Pace

The first 1–2 km of the Brick run allow the body to complete the transition and accept the heaviness in the legs. From the 2 km mark onward, begin attempting near-race pace, training your ability to control pace under fatigue.

Complete Weekend Long Training Day Example (70.3 Preparation, Build Phase)

Saturday:

• Depart at 6:00 AM: Carry 2 bottles of water + 3 energy gels + 1 serving of salt tablets
• Ride 90 km, following the intensity distribution design (approximately 3–3.5 hours)
• Immediately after dismounting, do a 10 km Brick run (first 2 km to adapt, last 8 km at target pace)
• Fueling: One energy gel every 30 minutes, water every 20 minutes
• After the session: Consume a carbohydrate + protein recovery meal within 30 minutes

Sunday:

• Schedule an easy long run of 60–75 minutes in the morning (easy aerobic pace)
• Or a 2000-meter easy aerobic swim

Practical Advice

1. Eat a substantial breakfast before the long ride: Consume a carbohydrate-rich breakfast 2–3 hours before departure (e.g., steamed bun + eggs + banana) to ensure adequate glycogen stores.

2. Test your fueling strategy during long sessions: Don’t wait until race day to try a brand of energy gel for the first time. Follow your race fueling timing and products during every long session to confirm there are no gastrointestinal issues.

3. Log data from every long session: Average bike power or heart rate, Brick run pace, fueling amount and timing, and post-session fatigue levels. This data is an important reference for designing your next long session and your race fueling plan.

4. Keep Sunday’s intensity conservative: After Saturday’s long ride + Brick, Sunday’s goal is “aerobic stimulation,” not “intensity challenge.” An easy jog or swim is sufficient—don’t crank up Sunday’s intensity just because Saturday felt good.

Conclusion

The weekend long training day is the most substantial session in your preparation cycle—completing one high-quality long ride + Brick will make you feel your race readiness progress more than seven easy aerobic sessions. Every Brick run after a fatiguing ride is telling your body: you’re almost ready. Design it thoughtfully, execute it seriously, and the weekend long session will become your strongest ally on race day.

Related Reading

• Triathlon Brick Training: Leg Adaptation Workout Design for Running Immediately After Cycling
• Triathlon Weekly Schedule Template: The Logic Behind Monday Rest + Tuesday Swim + Wednesday Run
• Brick Workout: The Core Session for Triathlon Transition Training
• Advanced 70.3 Brick Workouts: From Basic Transitions to Race Simulation