HIIT protocols, involving 4-8 bouts of 90-second near-maximum heart rate efforts per session, can be complementary to hypertrophy training and beneficial for well-rounded physiology.

“Ideal world, probably four to eight. - In that single session. - Ideal. - Right. If that takes you 20 seconds or 90 seconds, it's fine. If you want to do 30 on, 30 off. You want to do 20 on 40 off, 40 on 20 off, those numbers don't matter.”