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Workout
Hard-Start VO2 4×6 – Fast Oxygen Kinetics
HIIT
69 min
IF 0.61
Four 6-minute intervals opening with 30 seconds at 130% FTP before settling at 105%. The hard start spikes oxygen demand early so you spend more of each interval at VO2 max.
Duration
69 min
Blocks
5
Intensity
0.61
Workout analysis
Session profile and interval structure.
warmup · 55%15 min
Repeat 4 times
active · 130%30s
active · 105%5m 30s
recovery · 55%5 min
cooldown · 45%10 min
Training purpose
VO2-focused intervals raise aerobic ceiling and repeatability for attacks, climbs, and hard surges.
Useful when you want sessions that match tags such as VO2 Max, Hard Start, HIIT.
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Session summary
Ratings, tags, and related sessions.
Tags
VO2 Max
Hard Start
HIIT
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