Zone 2 Training: Pro Cycling’s Secret Weapon for Endurance & Power
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Professional cyclists are increasingly swapping long, steady rides for structured Zone 2 interval sessions that appear on Strava, TrainingPeaks and Instagram, with patterns such as 10 × 10‑minute, 5 × 20‑minute and 3 × 60‑minute blocks.
Understanding Zone 2
Zone 2 sits at the upper edge of the aerobic threshold, the point where blood lactate begins to rise sharply. Riding above this threshold quickly escalates effort, causing greater fatigue, heavier breathing and higher sweat rates.
A 1‑ to 2‑hour ride kept in Zone 2 feels almost the same at the start and finish, allowing repeatable workouts that boost fitness while limiting fatigue. Because high‑intensity intervals (Zone 5) cannot be sustained daily, riders rely on Zone 2 to round out weekly volume.
How Coaches Define the Zone
Laboratory step tests—usually in 10‑ to 20‑watt increments—measure power, heart rate, lactate and VO₂ max to pinpoint the aerobic threshold (Zone 2) and the anaerobic threshold (FTP). These data guide individualized training zones.
Structured vs. Steady Zone 2 Work
Longer rides generally target the lower end of Zone 2, while shorter blocks allow higher power. For a rider with a 420 W FTP and a 300 W aerobic threshold, a 7‑hour ride might stay around 220‑250 W (55‑60 % FTP), whereas a 1‑hour block could sit near 270‑300 W (65‑70 % FTP).
UNO‑X has championed structured sessions, regularly logging 10 × 5‑minute, 8 × 10‑minute and 6 × 20‑minute LT1 intervals—LT1 being the aerobic threshold and comparable to Zone 2.
Former UNO‑X rider Magnus Kulset explains that LT1 intervals let riders “ride very efficiently on a higher power output” by targeting power based on lactate rather than heart rate or feel.
UAE Team Emirates‑XRG also embraces aggressive Zone 2 training; a post from Tim Wellens showed a 6‑hour‑43‑minute ride at 285 W average power with a normalized power of 310 W.
Riders’ Personal Approaches
Brandon McNulty mixes both styles. On some days he logs 3‑5 hours at a low heart rate (115‑135 bpm), while on other sessions he completes three 1‑hour Zone 2 blocks at 300‑320 W and 140‑150 bpm.
Visma Lease‑a‑Bike appears to favor long, steady Zone 2 rides rather than interval blocks, although specific data are not published.
Matteo Jorgenson’s recent effort spanned 5 hours 32 minutes at an estimated 250‑270 W, illustrating a lower‑intensity, longer‑duration approach.
Choosing the Right Path
Riders targeting long breakaways may gain the most from boosting Zone 2 power, while sprinters or puncheurs might prioritize other training modalities. Mental focus is another factor; Magnus Kulset notes that short efforts help maintain concentration during indoor sessions.
For athletes with only six training hours per week, a series of 5 × 10‑minute high‑Zone 2 intervals could deliver more benefit than a single hour of low‑intensity riding.
Practical Steps
1. Define your performance goals and decide whether higher Zone 2 power would help. 2. Experiment with both structured intervals and steady rides to see which feels more effective. 3. Rotate methods as needed to keep training fresh and monitor any changes in performance.
Frequently Asked Questions
What exactly is Zone 2?
Zone 2 is the upper portion of the aerobic threshold where blood lactate begins to rise noticeably; effort feels sustainable for long periods without excessive fatigue.
Why are structured Zone 2 intervals becoming popular among pros?
Intervals let riders spend more time at a higher percentage of their Zone 2 power, potentially accelerating aerobic adaptations while keeping total training time manageable.
Do all professional teams use the same Zone 2 approach?
No. Teams such as UNO‑X favor short, high‑power LT1 intervals, UAE Team Emirates‑XRG push long, hard Zone 2 rides, Visma Lease‑a‑Bike leans toward extended steady rides and individual riders like Brandon McNulty blend both styles.
How might you adjust your own training to incorporate the benefits of structured Zone 2 work?