As pointed out above, 1 minute per day is clickbait. The study used 10 minutes per session. If you are fit, you probably will need more than a 3x20s session on a stationary bike as well.<p>HIIT &quot;works&quot;. Even with fit people. Probably especially with fit people. Think how sprinters train for instance.<p>It&#x27;s a bit hyped now of course. I&#x27;ve seen a lot on the web that puts together a standard circuit training type exercise and calls it as &quot;HIIT&quot;. Wrong. Nothing wrong with circuits <i>at all</i>, they are great, but you&#x27;re not going to get to 90% heart rate with planks. :)<p>&quot;Works&quot; too depends on your goals. &quot;Just HIIT&quot; is better than nothing, I&#x27;m sure. But HIIT is (typically) cardio; for best benefit, you would also strength train and do some mobility &#x2F; flexibility training as well. Diet is an important part of fitness as well.<p>I&#x27;ll be honest, I personally think HIIT is a better solution <i>for</i> the modestly fit versus the completely untrained. HIIT is much more physically demanding than a standard circuit or jog. Consequently, I think there is a greater possibility of &quot;overtraining&quot; or over-exerting yourself, perhaps to the point of injury. It really shouldn&#x27;t be &quot;1 minute per day&quot; for instance because 24 hours is probably not enough time for most people to recover from a legitimate HIIT session.