4 second HIIT during recovery week? Any downside?

A new study shows that repeats of 4 seconds intervals can improve fitness by 10% in otherwise sedentary middle-aged adults. https://www.nytimes.com/2020/12/30/well/move/can-4-seconds-of-exercise-make-a-difference.html Not really surprising when you consider it, but encouraging. Please spread the word among sedentary friends and parents, I suppose. But given this research, is there any significant downside to including some 4 second intervals in a recovery workout? My next week has Collins, Brasstown, and similar. If I include a 4 sec. interval for every minute or two, would that be positive or counter-productive? I would not include them in the final two workouts before my Ramp Test the following week.

Merge into this previous thread?


A post was merged into an existing topic: Ultra-low volume base