That Triathlon Show

Gordo Byrn on optimising Ironman training, the importance of volume and low intensity training, and practical age-group training

Jan 22, 2026
Gordo Byrn, a former investment banker turned Ultraman World Champion, shares his unique insights on triathlon training. He emphasizes the power of high-volume, low-intensity workouts, showcasing how they can enhance endurance without burnout. Gordo discusses his comeback to the sport at age 57, offering practical tips for age-group athletes. He also explores the differences in training methods from the 2000s to today, the significance of lactate testing, and why aspiring Ironman competitors should consider a longer preparation timeline.
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ADVICE

Use Combination Workouts For Frequency

  • Try combination workouts (e.g., jog to pool, swim, jog home) to add useful frequency without extra travel time. Keep them easy to improve movement economy in both disciplines.
ADVICE

Test Lactate To Set Real Low Zones

  • Do lactate testing early to find your true low-intensity zone and guide training pace. Use measured thresholds humbly and train easier than you think if your lactate shows inefficiency.
INSIGHT

Metabolic Gains Precede Obvious Fitness

  • Internal metabolic changes (lactate curves) can improve long before heart-rate-to-power shows gains. Patience and low-intensity volume produce rightward shifts in lactate thresholds over many months.
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