Very short intervals (4, 10, or 20 seconds) require 100% effort and significant motivation, and it is debated whether people prefer these over longer, easier workouts.

“now you're going down to let's say there's been 20 seconds there's been 10 seconds there's been four seconds it takes it's hard it takes a lot of motivation you have to be 100 on to get the most out of this 4 second or 10 second or whatever interval so there's a lot of debate understandably about like okay well which is it that people will do would they rather do 20 minutes at medium or you know 40 minutes easy or four seconds hard i think there's a lot of debate because there's different there's a lot of different people people like different things”