Bryan Johnson· Author
Aim to do this 4x4 HIIT workout 3 times per week, depending on your fitness level and recovery ability. Allow at least one rest day between sessions.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Aim to do this 4x4 HIIT workout 3 times per week, depending on your fitness level and recovery ability. Allow at least one rest day between sessions.
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
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Over time, you can increase the intensity or duration of the high-intensity intervals or reduce the rest periods to continue challenging your body and improving your VO2 max.
If you're new to high-intensity training, consider starting with lower-intensity workouts and gradually building up to this 4x4 HIIT routine.