16 weeks

Intermediate Half ironman Program - 16 Weeks

Complete Half ironman triathlon training plan for intermediate level. 16 weeks of structured preparation with swimming, cycling and running. 1.9km swim, 90km bike, 21.1km run.

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TriTrainer Coach

Certified Triathlon Coach

Our programs are designed by certified coaches with over 10 years of triathlon experience. Each plan follows scientific periodization principles used by professional athletes.

Our Training Methodology

Our scientific approach ensures optimal progression while minimizing injury risk.

Block Periodization

Plan division into distinct phases (Base, Build, Peak, Taper) with specific goals for each. This structure enables systematic progression and optimal supercompensation.

Progressive Overload Principle

Gradual increase in volume and intensity by 5-10% per week, with recovery weeks integrated every 3-4 weeks to allow adaptation.

Training Specificity

Sessions are designed to replicate race demands: bike-run transitions, race nutrition, and mental fatigue management.

Individualization

Each program can be adjusted according to your availability, level and goals. Key sessions are identified to help you prioritize.

Prerequisites and Required Level

This program is designed for intermediate level triathletes. Here's what we expect before starting:

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1-2 triathlons completed

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Goal to improve time

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Availability 6-10h/week

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Looking for progression

Detailed Training Phases

This 16-week program is divided into distinct phases, each with specific goals to optimize your progression.

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Base Phase

Weeks 1-5

Aerobic foundations and technique

Objectives:

  • βœ“Build solid aerobic base
  • βœ“Perfect technique
  • βœ“Assess and establish training zones
  • βœ“Create sustainable routines

Key workouts:

  • β€’Initial tests (CSS, FTP, vVO2max)
  • β€’Progressive Z2 volume
  • β€’Technical drills
  • β€’General strength
πŸ“Š 6-8 hours⚑ 85-90% Z1-Z2, 10-15% Z3
πŸ“Š

Build Phase 1

Weeks 6-9

Intensity introduction

Objectives:

  • βœ“Develop aerobic threshold
  • βœ“Introduce brick sessions
  • βœ“Progressively increase volume
  • βœ“Specific strength

Key workouts:

  • β€’Z3-Z4 swim intervals
  • β€’Long rides with tempo portions
  • β€’Progressive run
  • β€’Discovery brick
πŸ“Š 8-10 hours⚑ 75-80% Z1-Z2, 15% Z3, 5-10% Z4
πŸ“ˆ

Build Phase 2

Weeks 10-13

Race specific development

Objectives:

  • βœ“Work on target pace
  • βœ“Master race nutrition
  • βœ“Regular brick sessions
  • βœ“Volume peak

Key workouts:

  • β€’Race pace sessions
  • β€’Long session with full nutrition
  • β€’Partial simulation brick
  • β€’Progress tests
πŸ“Š 10-12 hours⚑ 70-75% Z1-Z2, 18% Z3, 7% Z4
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Peak Phase

Weeks 14-14

Simulations and fine-tuning

Objectives:

  • βœ“Full race simulation
  • βœ“Validate complete strategy
  • βœ“Maximum confidence
  • βœ“Progressively reduce volume

Key workouts:

  • β€’Race simulation (50-75% distances)
  • β€’Race pace brick
  • β€’Targeted reminder sessions
  • β€’Transition practice
πŸ“Š 8-10 hours⚑ 65-70% Z1-Z2, 20% Z3, 10% Z4-Z5
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Taper Phase

Weeks 15-16

Recovery and final preparation

Objectives:

  • βœ“Complete supercompensation
  • βœ“Physical and mental freshness
  • βœ“Logistics preparation
  • βœ“Visualization and confidence

Key workouts:

  • β€’Short sessions with intensity reminders
  • β€’Light technique swim
  • β€’Pre-race activation D-2
  • β€’Active rest
πŸ“Š 4-6 hours⚑ 80% Z1-Z2, 20% rappels Z3-Z4

Detailed Sample Week

Here's a sample week of your preparation. Sessions can be moved according to your constraints, but respect the balance between disciplines.

Training zones:

Z1 = Recovery (Very easy)
Z2 = Endurance (Easy)
Z3 = Tempo (Moderate)
Z4 = Threshold (Hard)
Z5 = VO2max (Maximum)
Monday
Active rest or technique swim
Light swim focused on technique or complete rest if fatigued.
Z1-Z230-45min
Tuesday
Swim intervals
400m warm-up + 10x100m threshold (r=20s) + 4x50m sprint + 200m cool-down
Z3-Z41h
Wednesday
Bike intervals
15min warm-up Z2 + 5x5min Z4 (r=2min Z2) + 15min cool-down
Z2-Z41h15
Thursday
Tempo run
15min warm-up + 20min tempo Z3 + 15min progressive cool-down
Z350min
Friday
Endurance swim + strength
2000m continuous + 30min triathlon-specific strength
Z21h30
Saturday
Simulation brick
1h30 bike with 2x20min Z3 + 30-40min progressive run
Z2-Z32h-2h30
Sunday
Long bike ride
Long ride with nutrition. Similar terrain to goal race if possible.
Z22h30-3h

Key Program Workouts

Each week includes key sessions in all three disciplines. These sessions are priority and should not be missed.

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Swimming

Technique session

1-2x/week

Drills, positioning, movement efficiency

Improves swim economy and reduces fatigue

Threshold intervals

1x/week

Threshold sets (CSS) with short recovery

Develops specific endurance and race pace

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Cycling

Long ride

1x/week

Zone 2 endurance with nutrition

Builds aerobic base and tests nutrition

Power intervals

1x/week

Threshold (Z4) or VO2max (Z5) work

Increases FTP and ability to sustain effort

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Running

Endurance run

2x/week

Easy run in zone 2, conversation possible

Active recovery and aerobic base

Tempo/threshold session

1x/week

Controlled pace running in zone 3-4

Prepares target pace and develops threshold

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Brick Sessions

Bike-run brick

1x/week

Bike followed immediately by run

Gets legs used to transition and simulates racing

Nutrition and Hydration

A proper nutrition strategy is essential to optimize your performance and recovery.

Before training

Meal 2-3h before with complex carbohydrates. Regular hydration in the preceding hours. Avoid fiber and fats before intense sessions.

During training

For sessions >1h: 60-90g carbohydrates/hour. Hydration: 500-750ml/hour depending on conditions. Use gels, bars or energy drinks.

After training

Metabolic window: consume protein + carbs within 30-45 minutes. Optimal ratio: 3:1 carbs/protein. Rehydrate with 150% of weight lost.

Race day

Breakfast 3h before start. Nothing new! Only use products tested in training. Plan your nutrition stations.

Recommended Equipment

Proper equipment improves your comfort and performance. Here is our selection by discipline.

Swimming

Essential
  • βœ“Swimsuit or wetsuit (if water <68Β°F)
  • βœ“Swimming goggles (2 pairs recommended)
  • βœ“Swim cap
Optional
  • β—‹Paddles and pull buoy for technique
  • β—‹Neoprene wetsuit for open water
  • β—‹Waterproof watch with GPS

Cycling

Essential
  • βœ“Road or triathlon bike in good condition
  • βœ“Approved helmet
  • βœ“Cycling shoes with cleats
Optional
  • β—‹Computer/GPS with power meter
  • β—‹Indoor trainer for indoor sessions
  • β—‹Aero wheels for racing

Running

Essential
  • βœ“Shoes suited to your gait
  • βœ“Technical breathable clothing
  • βœ“GPS watch
Optional
  • β—‹Elastic belt/laces for transitions
  • β—‹Sports sunglasses
  • β—‹Cap or visor

Common Mistakes to Avoid

Avoid these frequent pitfalls that can compromise your preparation.

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Neglecting recovery sessions

Solution: Recovery is as important as training. Respect rest days and deload weeks to allow adaptation.

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Increasing volume too quickly

Solution: Follow the 10% rule: don't increase your volume by more than 10% per week to avoid overuse injuries.

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Ignoring swim technique work

Solution: Technique in swimming represents 80% of performance. Dedicate time to drills and video analysis of your stroke.

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Training too intensely

Solution: 80% of your sessions should be in Z2 (endurance). Intensity should be targeted and planned, not systematic.

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Not testing race nutrition

Solution: Test your nutrition strategy during long sessions. Race day is not the time to try new products.

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Neglecting brick sessions

Solution: Bike-run transitions are specific to triathlon. Practice them regularly to get your legs used to it.

Frequently Asked Questions

For intermediate level, we recommend 16 weeks of preparation. This timeframe allows you to progressively build your endurance, develop technical skills in all three disciplines, and reach peak fitness at the right time. A program that's too short may not allow necessary physiological adaptations, while one that's too long can lead to excessive fatigue or motivation loss.

This program requires between 6 and 10 hours of training per week, spread over 6 sessions. Volume evolves by phase: lower in base phase to build foundations, volume peak in build phase, then progressive reduction toward race day. Sessions are balanced between all three disciplines, with particular emphasis on your identified weaknesses.

This program is designed for triathletes who already have a training base. If you're completely new, we recommend starting with our beginner program which will help you build the necessary foundations. If you already have regular sports practice (swimming, cycling or running), you could adapt this program by reducing intensities in the first weeks.

Essential equipment: for swimming, quality swimsuit and goggles; for cycling, a road or triathlon bike in good condition with approved helmet; for running, shoes suited to your gait. To go further: neoprene wetsuit for open water, power or heart rate sensor, and GPS watch. Investment can be progressive - start with essentials and add equipment as you progress.

Fatigue is normal and part of the adaptation process. Our program includes recovery (deload) weeks every 3-4 weeks where volume is reduced by 30-40%. Listen to your body: temporary fatigue after a hard session is normal, persistent fatigue over several days requires rest. Prioritize sleep (7-9h), hydration, and balanced nutrition. Don't hesitate to skip a session if needed - it's better to arrive rested at a key session than fatigued at all of them.

Absolutely, flexibility is key. Each week identifies 2-3 key sessions (marked as priority) that should not be missed. Other sessions can be moved or reduced according to your constraints. If you must skip a session, prioritize keeping key sessions and rest days. You can also combine some short sessions or use an indoor trainer to save time on bike sessions.

Several indicators help measure your progress: regular tests (CSS in swimming, FTP cycling, threshold pace in running) are integrated into the program. Daily, monitor your resting HR in the morning (should decrease with training), your sensations during Z2 sessions (easier over time), and your times on reference routes. Keep a training journal to note your sensations and identify trends.

Nutrition is the fourth pillar of triathlon. Daily: prioritize complex carbohydrates, quality proteins, and plenty of fruits/vegetables. Before training: meal 2-3h before with carbs. During (sessions >1h): 60-90g carbs/hour + hydration. After: 30-45min metabolic window for protein + carbs. On race day: nothing new! Test your nutrition strategy during long training sessions.

Bricks are essential in triathlon as they prepare your body (and mind) for the bike-run transition. The "heavy legs" sensation after cycling diminishes with practice. Our program includes at least one brick per week. Start with short transitions (30min bike + 15min run) and increase progressively. These sessions also allow you to test your nutrition and equipment in real conditions.

Pre-race stress is normal and can even improve performance. Our taper phase includes mental preparation elements: race visualization, strategy review, equipment checklist. Practical tips: arrive the day before if possible, course reconnaissance, tested wake-up and breakfast routine. On race day: focus on your plan, not others. Every triathlon is a learning experience.

Simple rules: symptoms above the neck (mild cold) = light training possible. Symptoms below (fever, body aches) = complete rest. For injuries: consult a professional, don't push through. A few days off has little impact on fitness. The program can be adjusted: shorten a phase, skip a build week, but keep the taper intact. Better to arrive slightly less prepared but healthy than risk worsening an injury.

Times vary based on level and course. For half-ironman: beginners aim for 6h-7h, intermediate 5h-6h, advanced Under 5h. These times are indicative - your first goal should be to finish and enjoy the experience. Times will come with experience and subsequent races.

Generate Your Personalized Program

Half ironman Intermediate program adapted to your availability and goals. Downloadable PDF and interactive calendar.

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