VO2max Turbo Session: 6×5-Minute Intervals with Full Recovery

Session Overview

This advanced turbo session uses six 5-minute maximum aerobic efforts with full 5-minute recovery intervals to target your VO2max — the upper ceiling of your aerobic power. By working at or above 105% of FTP and allowing complete recovery between efforts, this session creates the maximal aerobic stimulus needed to push your power ceiling higher. Best used in the build or peak phase of your training cycle, 3-4 weeks before your target race.

What You’ll Need

• Turbo trainer or smart trainer
• Power meter (recommended) or heart rate monitor
• Fan — essential for heat management during hard efforts
• Water and electrolytes within reach
• Current FTP value from a recent ramp test or 20-minute field test

Warm-Up (15 minutes)

Begin with 10 minutes of easy spinning at Zone 1 (below 55% FTP), focusing on smooth pedal stroke and relaxed upper body. Then complete 5 minutes of progressive build: 2 minutes at Zone 2, 2 minutes at Zone 3, and 1 minute at Zone 4. Finish with 2×30-second accelerations at 120% FTP (60 seconds easy between them) — this primes fast-twitch muscle fibres for the main set.

Main Set

6×5 minutes at 105-110% of FTP (Zone 5 / VO2max intensity), with 5 minutes easy spinning at Zone 1 between each effort. Total work time: 30 minutes. Total session with warm-up and cool-down: approximately 65-70 minutes.

• Intervals 1-2: Hold 105% FTP. This should feel hard but sustainable — breathing is forced and conversation impossible, but you should not be at maximum by the end of each interval.
• Intervals 3-4: Maintain the same power target. By now you will feel significant fatigue — resist the temptation to ease off. The aerobic adaptation happens at exactly this point of sustained discomfort.
• Intervals 5-6: Hold everything you have. If power drops more than 5% from your target, reduce cadence slightly to maintain wattage. These final two intervals are where the real fitness gains are made.
• Recovery intervals: Spin easy at Zone 1. Do not exceed 55% FTP — the full 5-minute recovery is essential. Curtailing it will compromise the quality of subsequent efforts.

Cool-Down (10 minutes)

After the final effort, spin easy for 10 minutes at Zone 1, gradually reducing cadence. This session creates significant metabolic stress — do not immediately stop pedalling. Allow your heart rate to return below 120 bpm before finishing. Have a recovery drink within 30 minutes of completing this session.

Coaching Notes

• Target cadence during efforts: 90-95 rpm. High cadence at VO2max power is more metabolically efficient and better transfers to open-road cycling.
• Heart rate lags behind power during these efforts — use power as your primary intensity guide, not heart rate.
• To make easier: reduce to 4×5 minutes, or extend recovery to 7 minutes. Do not reduce intervals below 4 minutes — shorter efforts do not create the same VO2max stimulus.
• To make harder: progress to 8×5 minutes over three to four weeks. This session is a cornerstone of 70.3 and Olympic distance preparation.