VO2 as a percent of FTP is a range that varies person to person. It can be anywhere from ~112-125%. So some people may fall at 125% and find the prescribed 120% intervals pretty manageable. While others have an FTP that is closer to their VO2max Power and find those super challenging. So as long as lowering the intensity to 95% still keeps those intervals hard (toward the end of the workout they should be extremely difficult) you are probably still working in your own VO2 range for those intervals.
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