Scaling up interval time for vo2

I failed at Spencer 6 x 3 min at 120% of FTP this spring at the end of SSB2 low volume. I have spent the summer doing 2.5 hr rides 3 x week and Coach Chad’s VO2 progression. I did Spencer today and was able to complete all of the intervals. ( 65 years old, riding for 15 months after a 10 year layoff)

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