Six Months to IRONMAN: Building Bike Fitness That Makes (not breaks) Your IM | Ep 570
Oxygenaddict Triathlon Podcast
Why the bike leg must dominate training
Coach Rob explains why bike training should take priority for 70.3 and Ironman athletes.
In this episode Coach Rob continues the Six Months to Ironman series by breaking down exactly how to structure your bike training for Ironman and 70.3 racing over the next 6 months.
If you’re a busy age-group athlete with limited training time, this episode will help you stop wasting hours on the bike and start building bike fitness that translates to raceday speed on the bike - and on the run.
The bike leg dominates Ironman racing. Get it right, and you set yourself up for a great run. Get it wrong, and the race unravels fast. In this episode, Rob explains how to train the bike intelligently, not just harder.
Why the bike leg should dominate your Ironman training — not the run
The fitness halo effect from bike fitness to run performance (and why it doesn’t work the other way round)
Why cycling lets you build aerobic fitness without the injury and soreness risk of hard running
How to structure the perfect Ironman bike week with just three rides
The two key phases of bike training:
Building engine size (FTP)
Converting that fitness into Ironman-specific endurance
How hard your long rides should actually be (and why “a bit too hard” quietly ruins endurance gains)
Simple, practical markers for Zone 2 riding using feel, heart rate, and power
Strength endurance (big gear) sessions: who they’re for and how to do them safely
Aerobic conditioning / sweet spot intervals for Ironman athletes
When indoor training beats outdoor riding — and when it doesn’t
why bike discipline on race day (power control, fuelling, hydration, and ego management) is often the difference between running well off the bike and detonating halfway through the marathon.
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SPONSORS
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Thinking about your first Ironman or 70.3 in 2026? At Team Oxygenaddict, we specialise in helping busy professionals fit high-quality training around demanding jobs and family life.
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