Triathlon Training Plan 70.3: 16-Week Program
Introduction to the 70.3 Distance
A half Ironman, or 70.3 triathlon, consists of a 1.2-mile swim, 56-mile bike, and 13.1-mile run. Completing this challenging distance requires dedicated training, proper preparation, and a structured approach. This 16-week training plan is designed for intermediate triathletes who have completed at least one Olympic-distance triathlon and have a solid fitness base in all three disciplines.
Prerequisites Before Starting
- Ability to swim 1,500 yards/meters continuously
- Comfort cycling 40+ miles and 2.5 hours in the saddle
- Experience running at least 8-10 miles in a single training session
- At least one Olympic-distance triathlon completed
- 6-8 hours available weekly for training
Training Phases
This 16-week plan is divided into four distinct phases, each with specific training objectives:
Base Phase (Weeks 1-4)
Focus on building aerobic capacity and improving technique in all three disciplines. Training volume increases gradually, with an emphasis on consistency rather than intensity. This phase establishes the foundation for more demanding training to come.
Build Phase (Weeks 5-10)
Introduce sport-specific intensity while continuing to build endurance. Workouts become more challenging, incorporating threshold efforts, intervals, and race-pace training. Bricks (combined bike-run workouts) become more frequent and longer.
Peak Phase (Weeks 11-14)
This period combines your longest training sessions with high-intensity work. The most challenging workouts occur during this phase, simulating race conditions. Volume peaks at week 13, allowing you to test your fitness and mental preparation.
Taper Phase (Weeks 15-16)
Significantly reduce training volume while maintaining some race-pace intensity. This reduction allows for full recovery and ensures you arrive at the starting line rested and ready to perform at your best.
Weekly Structure
Each week follows a consistent pattern that balances training, recovery, and adaptation:
- Monday: Recovery swim or easy run
- Tuesday: Intense run workout
- Wednesday: Swim workout with technique and threshold pace
- Thursday: Bike session with intensity work
- Friday: Recovery day with optional strength training
- Saturday: Long bike ride followed by short transition run
- Sunday: Long aerobic run
Workout Details
Swim Training
Swimming workouts include warm-up, drill sets, main set, and cool-down. Aim for 3 swim sessions weekly focusing on technique, endurance, and race-specific pace efforts.
Bike Training
Cycling comprises the largest portion of your training time. Workouts progress from endurance-based rides to intervals that build strength and power. Include brick sessions practicing the bike-to-run transition.
Run Training
Running training requires careful progression to minimize injury risk while building the necessary endurance for the half marathon distance.
Strength Training
Include 1-2 strength sessions weekly focusing on core stability, functional movements, and injury prevention exercises for hips, knees, and shoulders.
Sample Weekly Schedule
| Day | Activity | Duration | Workout Details |
|---|---|---|---|
| Monday | Recovery Swim | 45 min | Easy swim with form focus (2,000 yards) |
| Tuesday | Run Intervals | 55 min | Warm-up, 5 x 1km at race pace, cool-down |
| Wednesday | Swim Quality | 60 min | Warm-up, 10 x 100m at threshold, cool-down (2,800 yards) |
| Thursday | Bike Intervals | 90 min | Warm-up, 4 x 10 min at threshold, cool-down |
| Friday | Recovery Day | 45 min | 30 min easy run + optional strength work |
| Saturday | Long Brick | 3 hr 15 min | 2 hr 45 min bike + 30 min transition run |
| Sunday | Long Run | 1 hr 45 min | Aerobic long run (10-11 miles) |
Nutrition and Hydration Strategy
Proper nutrition is critical for supporting training and ensuring optimal race-day performance:
- For sessions over 90 minutes, consume 60-90 grams of carbohydrates per hour
- Take in 20-24 oz of fluids per hour during training
- Include 300-500mg of sodium per hour during longer sessions
- Practice your race-day nutrition plan during training
Recovery and Injury Prevention
Treat recovery with the same importance as your hard workouts:
- Sleep 7-9 hours nightly to maximize hormonal response and tissue repair
- Implement proper cool-downs after intense sessions
- Use foam rolling, massage, or stretching for muscle maintenance
- Monitor your resting heart rate to avoid overtraining
- Take planned recovery weeks every 3-4 weeks with 40% volume reduction
16-Week Training Overview
Weeks 1-4: Base Phase
- Week 1: Focus on form in all disciplines; lower volume
- Week 2: Slight increase in endurance; introduce brick sessions
- Week 3: Continuing aerobic development; longer weekend sessions
- Week 4: Recovery week with 40% reduction in volume
Weeks 5-8: Build Phase
- Week 5: Introduce threshold efforts in all sports
- Week 6: Longer interval work; extend brick sessions
- Week 7: Race-specific intervals; first 3+ hour ride
- Week 8: Recovery week with maintained intensity but reduced volume
Weeks 9-14: Peak Phase
- Week 9: Build endurance with longer race-pace intervals
- Week 10: Highest intensity week with hill repeats and speed work
- Week 11: Volume increase; focus on race-specific efforts
- Week 12: Recovery week with emphasis on quality over quantity
- Week 13: Peak volume week including longest training sessions
- Week 14: Begin intensity reduction while maintaining some race-pace work
Weeks 15-16: Taper Phase
- Week 15: Significant volume reduction (~50%) with maintained intensity
- Week 16: Race week with minimal volume and open water swim practice
Race Week Preparation
During your final week, focus on both physical and mental preparation:
- Maintain your normal sleep schedule
- Taper activities to save energy but keep your mind engaged
- Prepare all race equipment and perform final gear checks
- Review the race course, transition layout, and rules
- Visualize successful race execution
- Stay hydrated with electrolytes throughout the week
- Avoid trying new foods, products, or training methods
Key Training Tips
- Progress gradually - increases in weekly volume shouldn't exceed 10%
- Listen to your body - adjust training plan based on recovery needs
- Include transition practice - efficient transitions save valuable race time
- Train in similar conditions to your race when possible
- Remember that consistency beats intensity - stick to the plan
This 16-week training plan provides the framework for your 70.3 preparation. However, individual needs may vary based on fitness level, experience, and recovery capacity. Consistent, smart training combined with adequate recovery will prepare you for your best possible half Ironman performance.
Triathlon Training Plan 70.3 16 Week Plan and Reference File Download Link
