20-Week Flat 70.3 Triathlon Plan – Beginner / First-Timer
This 20-week flat 70.3 triathlon plan is designed for first-time or newer 70.3 athletes preparing for flatter, faster courses where sustained pacing, aerodynamic efficiency, and run durability are critical.
Whether you’re tackling your first middle-distance triathlon or stepping up from shorter events, this plan focuses on aerobic development, consistent execution, and smart pacing — helping you arrive on race day confident and well prepared without unnecessary complexity.
The structure is well suited to flat or fast 70.3-style courses, similar in profile to events such as Outlaw Half, Barcelona 70.3, Dubai 70.3, Florida 70.3, and other middle-distance races where disciplined pacing and endurance matter more than climbing strength.
Written by Enduraprep Head Coach Lawrence Cronk, who has coached 100+ long-course triathlon finishes — from complete first-timers through to Ironman World Championship qualifiers — this plan reflects real-world coaching experience rather than generic templates.
Who This Plan Is For
First-time 70.3 athletes
Athletes stepping up from sprint or Olympic distance
Anyone preparing for a flat or fast middle-distance triathlon
Athletes training around work and family commitments
Those who prefer clear structure, steady progression, and defined pacing guidance
Training Requirements & Equipment
You’ll need:
A smart trainer for weekday indoor bike sessions
A road or triathlon bike (power meter helpful but not essential for outdoor rides)
A basic GPS watch for run pacing or heart rate
Pool access 2× per week
All workouts include clear intensity targets and execution notes.
Plan Structure
20-week progressive build with recovery every 4th week
Weekly training volume builds from ~5 hours to ~10 hours
Weekday sessions mostly capped at ~60 minutes for sustainability
Longer weekend sessions with indoor or outdoor bike options
Two race-simulation weekends included
Key Features
Flat-course specificity: sustained tempo work and pacing discipline
Structured workouts compatible with Garmin, Wahoo, Zwift & other platforms
Clear coaching notes explaining purpose, intensity, and execution
Regular progress testing for swim, bike, and run
Built to support strong bike execution and a controlled run off the bike
Why This Plan Works
Flat courses reward consistency, discipline, and patience.
This plan develops the aerobic base, durability, and pacing control needed to ride efficiently and run strongly off the bike — without excessive volume or unnecessary intensity.
For personalised coaching or event-specific training plans, visit:
👉 www.enduraprep.com/online-coaching
At Enduraprep we coach athletes of all levels — from first-time racers to competitive age-groupers chasing IRONMAN or Gran Fondo World Champs slots. Our athletes have taken on everything from 5 km runs & sprint triathlons to multi-day ultra-marathons & extreme challenges.
We provide remote coaching to athletes worldwide, supported by performance testing (VO₂ max & resting metabolic rate) in South Wales, UK. Plus training camps at our base in training paradise, The Kamnik Savinja Alps, Slovenia.