VO2max Bike Intervals: Raise Your Cycling Ceiling

Session Overview

VO2max intervals are the most powerful tool for increasing your cycling peak power. This advanced 60-minute turbo session uses short, very high-intensity efforts to push your aerobic ceiling higher — translating directly to a faster, more sustainable power output on the bike leg of your next triathlon.

What You’ll Need

• Smart turbo trainer with ERG mode (Wahoo KICKR, Tacx, Elite)
• GPS watch or cycling computer for heart rate monitoring
• Fan — essential; you’ll overheat without forced air movement
• Electrolyte drink — VO2max intervals cause heavy sweating

Warm-Up (15 minutes)

Spin easy for 10 minutes at 90–100 RPM in a light gear, then perform 3 x 30-second build-ups, each ending at 110–115% of FTP. Rest 30 seconds between build-ups. These priming efforts activate your fast-twitch fibres before the main set without causing pre-fatigue. Your legs should feel snappy, not tired.

Main Set

The main set targets VO2max intensity — your maximum sustainable aerobic power, typically 108–120% of FTP. Short recoveries between efforts maintain the training stress; don’t extend them or you’ll reduce the adaptation.

• 5 x 3 minutes at 110–115% of FTP, 3 minutes easy spinning between each (RPE 9/10 on intervals)
• Rest 5 minutes easy spinning after the set
• Optional round 2: 3 x 2 minutes at 115–120% FTP, 2 minutes recovery (advanced athletes only)

Cool-Down (10 minutes)

Spin very easily for 10 minutes at 80–90 RPM in the lightest gear. Your legs will feel heavy — this is normal. The cool-down is critical to flush metabolic waste products and begin the recovery process. Don’t skip it, even when you’re exhausted.

Coaching Notes

• VO2max work is demanding — only schedule this session once per week, with at least 48 hours of easy training before and after.
• If you don’t have a power meter, use perceived effort: intervals should feel like you’re working as hard as you can while still maintaining cadence above 85 RPM.
• Scaling easier: reduce to 4 x 3 min intervals, or extend the recovery to 4 minutes between efforts. Don’t reduce interval intensity — the ceiling is the point.
• Heart rate will peak 60–90 seconds into each interval and continue rising. By interval 4 or 5, you’ll hit near-maximum HR. This is the goal.