What are Five by Fives? Amber mentioned dreading them in the last two podcasts

[HMG]

There are several lengthy forum posts re: short vs long VO2 max intervals. Here’s one:

VO2 Max: Short vs Long Intervals

Got a bit of a (perhaps) dumb question. I did a little block of VO2 max work over the last 2 weeks. Last week I was able to finish Spencer +2 and a custom version of Monadnock with 6x3 @ 122%. I started General Build Low Volume this week and have Spanish Needle (15/15s @ 150%) coming up. Because of my schedule, I didn’t do a ramp test to start off because I only had 2 days to get a decent workout this week. So my FTP is the same that I completed Spencer +2. My question is: what would provide th…

Probably best to form your own opinion, but longer intervals are more effective for me personally.