Intermediate · 70.3 (Half Ironman)
16-Week 70.3 Half Ironman Training Plan
Build the endurance for a 1.9K swim, 90K bike, and 21.1K run.
- Event
- 70.3 (Half Ironman)
- Level
- Intermediate
- Length
- 16 weeks
- Days / week
- 6
The full 16-week plan as a PDF, every session, styled like the app.
The full plan, week by week
Base, build, peak, then taper: periodised so you arrive on race day fit and fresh, not overtrained.
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Week 1
Base
Long Easy Easy Drill Long Long
Key session Long Ride 57.80 km
Weekly volume 6h 03m
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Week 2
Base
Long Easy Easy Drill Long Long
Key session Long Ride 67.28 km
Weekly volume 6h 44m
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Week 3
Base
Long Easy Easy Drill Long Long
Key session Long Ride 76.77 km
Weekly volume 7h 25m
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Week 4
Base
Long Easy Easy Drill Long Long
Key session Long Ride 82.94 km
Weekly volume 7h 45m
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Week 5
Base
Long Easy Easy Drill Long Long
Key session Long Ride 89.10 km
Weekly volume 8h 06m
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Week 6
Build
Long Threshold Threshold Threshold Long Brick
Key session Brick: Easy Bike → Run 85.22 km
Weekly volume 8h 33m
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Week 7
Build
Long Threshold Threshold Threshold Long Long
Key session Long Ride 82.46 km
Weekly volume 7h 48m
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Week 8
Build Recovery
Long Threshold Threshold Threshold Long Brick
Key session Brick: Easy Bike → Run 74.13 km
Weekly volume 7h 25m
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Week 9
Build
Long Threshold Threshold Threshold Long Long
Key session Long Ride 89.10 km
Weekly volume 8h 21m
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Week 10
Build
Long Threshold Tempo Tempo Long Brick
Key session Brick: Pacing Bike → Run 44.01 km
Weekly volume 6h 49m
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Week 11
Build
Long Threshold Tempo Tempo Long Brick
Key session Brick: Pacing Bike → Run 46.52 km
Weekly volume 7h 10m
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Week 12
Build Recovery
Long Threshold Tempo Tempo Long Brick
Key session Long Run 13.24 km
Weekly volume 6h 03m
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Week 13
Peak
Long Long Tempo Tempo Long Brick
Key session Brick: Swim → Bike → Run 93.23 km
Weekly volume 9h 41m
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Week 14
Peak
Long Long Tempo Tempo Long Brick
Key session Brick: Swim → Bike → Run 93.23 km
Weekly volume 9h 41m
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Week 15
Taper
Easy Easy Tempo Tempo Long Brick
Key session Brick: Easy Bike → Run 32.34 km
Weekly volume 5h 01m
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Week 16
Race
Easy Easy Easy Recovery Easy Race Day
Key session Race Day: Triathlon 113 km
Weekly volume 9h 04m
Row shading shows each week's training volume against the peak week.
This outline is the skeleton. Gritup makes it yours.
A printed plan can't know that you were travelling last week, that your long run felt awful, or that your fitness jumped. Gritup takes this exact structure and makes it adaptive:
- Calibrated to you. Paces and zones set from your recent results, not a generic label.
- Adapts when life happens. Miss a session or a week and the plan rebuilds the path to race day.
- Fits your real schedule. Choose your training days, and the plan reshapes around them instead of the other way round.
- One app, every sport. Run, bike, swim, or combine them for triathlon, without juggling separate apps.
Get the adaptive version on your phone
Frequently asked
How many days a week is the 16-week 70.3 half ironman training plan?
This plan runs 6 days a week over 16 weeks, structured in base, build, peak, and taper phases. If 6 days doesn't fit your week, Gritup can rebuild the same goal around the days you actually have.
Is this 70.3 (half ironman) plan right for a intermediate athlete?
Yes, it's written for a intermediate athlete. It assumes you already have a training base and layers in threshold and race-specific work. In the app, the plan calibrates to your recent results rather than a one-size label.
What happens if I miss a session or get sick?
With a static plan you're on your own: shift the week and hope the balance still works. Gritup re-plans the remaining weeks around a missed session, an injury, or a busy stretch, so you always have a coherent plan to race day instead of a broken schedule.
Is this training plan really free?
Yes. The full week-by-week outline on this page is free to follow. Gritup itself is a subscription that turns this skeleton into an adaptive, personalised plan, with a free trial and no card required to start.
70.3 (Half Ironman) plan
Follow the outline. Or let Gritup run it for you.
Get this 16-week plan as an adaptive, personalised programme that adjusts to your fitness and your week, free for the first two weeks.