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24-Week 70.3 Triathlon Plan (Half-Ironman)

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24-Week 70.3 Triathlon Plan (Half-Ironman)

Author

Core Endurance Coaching

All plans by this Coach

Length

24 Weeks

Plan Description

24-Week 70.3 Ironman Training Plan

Structured • Progressive • Real-World Tested

This 24-week program is designed for athletes targeting a 70.3 Ironman who want a clear, data-driven, and adaptable roadmap from baseline testing to race day.
The plan blends endurance, intensity, and recovery in a progressive structure that peaks at race-specific pace while minimizing injury risk.

Who It’s For
• Intermediate athletes with a consistent base (4–6 hr/week)
• Time-crunched age-groupers balancing work, family, and racing
• Triathletes seeking structure with flexibility — based on heart rate, pace, or power

What You Get

✅ Pre-Week 1 (Preparation Phase): Equipment setup, mobility, and baseline readiness
✅ Base Phase (Weeks 1–8): Aerobic foundation, testing, and endurance building
✅ Build 1 (Weeks 9–12): Threshold development and early race-pace work
✅ Build 2 (Weeks 13–20): Peak volume, long bricks, and nutrition practice
✅ Taper & Race Phase (Weeks 21–23): Freshness, sharpening, and execution
✅ Post-Race Recovery (Week 24): Structured recovery and reflection

Training Structure
• Swim: 2–3 sessions/week (2,000–4,000 yd avg)
• Bike: 3–4 sessions/week (4–7 hr avg)
• Run: 3–4 sessions/week (2–4 hr avg)
• Strength & Mobility: 1–2x weekly integrated sessions

Key Features
• Detailed warm-ups, main sets, cooldowns, and purpose for every workout
• Power, pace, and heart-rate zone guidance
• Progressive brick sessions to optimize race-day transitions
• Recovery-focused deload weeks every 4th week
• Six-dimension Focus Grid (FTP • Strength • Endurance • Sprints • Technique • Recovery)

Results

By the end of 24 weeks, you’ll be able to:
• Confidently execute a 70.3 race from start to finish
• Sustain your target race pace with proper fueling and pacing
• Arrive on the start line healthy, fresh, and mentally sharp

How it Works

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Training Plan Sample Week

Stats

Average Weekly Breakdown

Workouts Weekly Average Longest Workout
Run x4
04:09:00 02:30:00
Swim x4
02:47:00 01:00:00
Bike x4
05:49:00 05:00:00
Custom x1
00:35:00 00:30:00
X-Train x1
00:22:00 00:30:00
strength x1
—— ——
Workouts Per Week Weekly Average Longest Workout
Run
04:09:00 02:30:00
Swim
02:47:00 01:00:00
Bike
05:49:00 05:00:00
Custom
00:35:00 00:30:00
X-Train
00:22:00 00:30:00
strength
—— ——

Training Load By Week


This plan works best with the following fitness devices:

  • Power Meter
  • Heart Rate Monitor
  • GPS

All supported devices

Breno Melo & Heidi Wu

Core Endurance Coaching

Building Your Foundation for Peak Performance
At Core Endurance Coaching, we believe you can't fire a cannon from a canoe. This principle drives everything we do. Just as a cannon needs a stable platform to deliver its power effectively, endurance athletes need a rock-solid foundation - both in their physical core and their training fundamentals - to achieve peak performance in triathlon, running, and cycling.


  • This plan includes a Free Basic TrainingPeaks Account.
  • Access your training plan anywhere on the TrainingPeaks mobile and desktop apps.
  • Track your performance with robust data tracking and detailed graphs.
  • Plan for your event in the TrainingPeaks calendar.
  • Track your weight, sleep, hours, fatigue and stress while you train.
  • Completed workouts sync with popular apps like Garmin and Wahoo. Learn More
  • If plan includes Structured Workouts, then planned workouts sync to compatible devices and guide you through workouts in real time. Learn More

Refund Policy

This plan is protected by our Refund Policy and may, with the author's approval, be exchanged for a plan of equal value from the same author.

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