I agree that many people don&#x27;t understand what a 100% workout is, but &quot;There&#x27;s not really a way to cheat your body or find an easy way out of a workout&quot; is unjustified by the evidence.  It&#x27;s suspiciously close to appealing to justice, e.g., &quot;You won&#x27;t get fit without hard work because you won&#x27;t <i>deserve</i> it.&quot;<p>People have swore by all sorts of unpleasant fitness regimes in the past which are later shown to be unproductive. Now, we have good reason to believe that you can&#x27;t be an elite athlete without putting in lots of time, simply because elite athletes can be easily identified; we&#x27;d see more elite athlete with short training regimes if it was possible.  But, like the incredibly muddied literature on nutrition, it&#x27;s not at all clear how to optimize moderate (non-elite) exercise for long-term health benefits.  We really don&#x27;t know where the low-hanging fruit is, and its entirely possible that most people are wasting their time.