Indoor Brick Training: Transition Planning and Practical Tips for Zwift + Treadmill

Taiwan’s winter brings continuous rain, summer brings afternoon thunderstorms, and rush hour traffic is relentless—many times you want to do a brick workout but can’t get outside. Indoor brick (Zwift + treadmill) is the perfect alternative, and it’s even more precise and safer than outdoor training.

1. Advantages and Limitations of Indoor Brick Training

Advantages

1. Weather-independent: Train at any time
2. Precise intensity: Smart trainer + treadmill allow controlled power/pace
3. Complete data: Heart rate, power, pace, and distance all recorded
4. Safety: No traffic or road hazards
5. Easy fueling: Water, food, and towels within arm’s reach
6. Equipment testing: Can pause mid-session to make adjustments

Limitations

1. Lack of wind resistance: Indoors feels 5–10% easier than outdoors
2. Heat buildup: No natural wind cooling
3. Running form differences: Treadmill gait differs slightly from outdoor running
4. Mental aspect: No scenery, more monotonous
5. Space constraints: Trainer and treadmill need to be close together

2. Indoor Brick Equipment Setup

Bike Trainer

Type	Price	Recommendation
Smart direct-drive	NT$25,000–60,000	★★★★★
Smart wheel-on	NT$10,000–20,000	★★★★
Magnetic resistance trainer	NT$5,000–10,000	★★★
Wind resistance trainer	NT$3,000–6,000	★★ (Noisy)

Recommended brands: Wahoo Kickr, Tacx Neo, Elite Suito, Saris H3

Treadmill

• Motor power: At least 2.5 HP
• Speed range: 0–22 km/h
• Incline: 0–15%
• Cushioning: Good belt cushioning to reduce knee impact

Recommended brands: NordicTrack, SOLE, Bowflex Treadmill

Auxiliary Equipment

• Large fan: Simulates outdoor wind cooling (essential!)
• Large-screen TV: Displays Zwift
• iPad / phone mount: For watching videos on the treadmill
• Multiple bottles: Hydration station next to the trainer
• Towels + sweat mat: Prevents sweat from damaging equipment

3. Indoor Brick Workout Templates

Template A: Short Indoor Brick (45 minutes)

Time	Equipment	Content
0:00–0:05	Zwift	Warm-up at 60% FTP
0:05–0:30	Zwift	Steady at 75% FTP
0:30–0:32	Transition	60–120 seconds
0:32–0:42	Treadmill	Z2 pace

Template B: Intensity Indoor Brick (75 minutes)

Time	Equipment	Content
0:00–0:10	Zwift	Warm-up
0:10–0:50	Zwift	5×5 minutes Z4 + 3 minutes recovery
0:50–0:53	Transition	Approximately 3 minutes
0:53–1:15	Treadmill	Race pace for 22 minutes

Template C: Race Simulation Indoor Brick (3 hours)

Time	Equipment	Content
0:00–0:15	Zwift	Warm-up
0:15–2:15	Zwift	Steady Z2 + 1×5 minutes Z3 every 30 minutes
2:15–2:20	Transition	Full simulation
2:20–3:00	Treadmill	IM pace for 40 minutes

4. Choosing Zwift Workouts

Using Zwift Training Plans Directly

Recommended plans:

• “Build Me Up”: 12-week training plan
• “Pebble Pounder”: 51.5 triathlon preparation
• “Iron Triathlon Plan”: IM distance training
• “Tri Tune Up”: 4-week pre-race taper

Custom ERG Mode Workouts

Create your own using the Zwift Workout Editor:

Example: Sweet Spot Brick Front Half

10 minutes at 60% FTP (warm-up)
3 × [10 minutes at 88% FTP + 5 minutes at 60% FTP]
5 minutes at 70% FTP (cool-down)
Total time: 60 minutes

Free Ride Mode

Choose the “Tempus Fugit” route in Watopia (flat, long road), control power freely, and simulate steady race riding.

5. Transition Strategies

The key to indoor brick training is a “fast and realistic” transition.

Transition Area Setup

• Place the treadmill within 1–2 meters of the trainer
• Running shoes pre-positioned (elastic laces)
• Run cap and nutrition ready
• Towel on standby

Transition Steps (90–120 seconds)

1. Dismount the bike (10 seconds)
2. Wipe sweat, remove cycling shoes (20 seconds)
3. Put on running shoes (15 seconds)
4. Walk to the treadmill (10 seconds)
5. Start the treadmill + increase speed (20–30 seconds)
6. Reach target pace (15 seconds)

6. Pace Differences Between Treadmill and Outdoors

Why Does the Treadmill Feel Easier?

1. No wind resistance: Even on a calm day outdoors, there’s 5% wind resistance
2. Belt assistance: The moving surface provides a slight forward pull
3. Stable environment: Completely flat terrain

Pace Correction

Pace	Treadmill Pace Setting	Incline
Outdoor 5:00/km	Treadmill 5:00/km	1%
Outdoor 4:30/km	Treadmill 4:30/km	1%
Outdoor 4:00/km	Treadmill 4:00/km	1.5%

Recommended incline setting of 1%: Simulates outdoor wind resistance for a more realistic feel.

7. Body Temperature Management

Why Body Temperature Spikes Indoors

• No natural wind cooling
• Indoor temperature is stable but not low
• Trainer / treadmill generate heat

Solutions

1. Large industrial fan: Point it at your upper body
2. Air conditioning + fan combo: Lower room temperature to 22–24°C
3. Ice towel: Cool the back of the neck and wrists
4. Hydrate more: 200ml every 15 minutes
5. Training clothing choice: Thin and breathable

8. Mental Aspects

Why Is Indoor Training Hard to Stick With?

• No scenery changes
• Time feels slower
• Surroundings remind you you’re “at home”
• Easy to stop and rest

Motivation-Boosting Strategies

1. Zwift Community Events: Group rides, races, Race
2. Netflix / YouTube: Watch shows on the treadmill
3. Music Playlists: High-BPM music
4. Set Goals: Monthly mileage, Strava challenges
5. Training Partners: Train together via video

9. Indoor Brick Record Management

Garmin / Wahoo Sync

• Switch watch to “Multisport” mode before training
• Press “Lap” at the end of the bike segment to auto-switch to running
• Start running mode for the run segment
• Sync to Strava after finishing

Key Data Recording

Segment	Key Data
Bike Segment	Average power, NP, IF, heart rate
Transition	Time duration
Run Segment	Average pace, heart rate, cadence
Overall	TSS, total time, calories

10. Indoor vs. Outdoor Brick Comparison

Item	Indoor	Outdoor
Intensity Control	★★★★★	★★★
Safety	★★★★★	★★★
Convenience of Fueling	★★★★★	★★
Realism	★★	★★★★★
Mental Challenge	★★	★★★★
Wind Resistance Training	★	★★★★★
Water Intake	High (poor heat dissipation)	Moderate
Suitable Sessions	Short sessions, intensity training	Long sessions, race simulation

Recommended Ratio

• Training phase: 60% indoor + 40% outdoor
• 8 weeks before race: 40% indoor + 60% outdoor
• 4 weeks before race: 100% outdoor (unless weather prevents it)

11. One-Week Practical Schedule (Winter Race Prep)

Day	Workout	Indoor/Outdoor
Monday	Rest	—
Tuesday	Short Brick (45 min)	Indoor
Wednesday	Swim + Easy Run	Pool + Outdoor
Thursday	Zwift Race 1 hour	Indoor
Friday	Run Intervals	Outdoor (or treadmill)
Saturday	Long Brick (3 hours)	Outdoor
Sunday	Active Recovery	Outdoor

12. Common Indoor Brick Questions

Q1: The trainer’s ERG mode always feels like I “can’t turn the pedals”?

A: The set power is too high, or you haven’t warmed up enough. Do a 10-minute warm-up at 60% FTP first.

Q2: My feet hurt from running on the treadmill?

A: The treadmill deck may lack sufficient cushioning, or the shoes aren’t suitable. Try cushioned shoes (Hoka, Asics Gel-Kayano).

Q3: I sweat too much after training and the floor gets wet?

A: Place a sweat mat under the trainer and a yoga mat under the treadmill. Use fans to improve heat dissipation.

Q4: Should I drink water during the transition?

A: Yes! You can drink 200ml in 90 seconds to replenish fluids lost during the bike segment.

Q5: Is a heart rate 10 bpm higher than outdoors normal?

A: Yes, it’s mainly caused by elevated body temperature. Improve heat dissipation.

Indoor Brick is the secret weapon of modern triathletes—weather should never be an excuse for skipping training.

Related Reading

• Brick Workout: The Core Session for Triathlon Transition Training
• Data Quality in Zwift and Indoor Training: Analysis of Differences from Outdoor Riding
• Indoor Trainer Power Workouts: Comparing Structured Training in Zwift and TrainerRoad
• The Complete Guide to Stationary Trainers: Zwift vs. TrainerRoad