
1:27
Ben Greenfield does a 15-minute REHIT workout on an AI-powered exercise bike called Carol. The session uses 10-second sprints with 2-minute recovery periods, tracks heart rate and VO2 max, and fits serious training into a short break.
Questions this video answers
15 minutes
2 minutes
10 seconds
2 minutes
VO2 max test, FTP (functional threshold power) test, and a ramp-to-maximum test










