That is very much unsubstantiated, all kinds of athletes enjoy and thrive training fasted. It&#x27;s probably much more complex in what&#x27;s best for whom than just &quot;much more likely to hit the wall&quot;. Type of metabolism, levels of fat adaption, type of activity, length of activity, etc all matters.<p>As an personal anecdote, I enjoy climbing in the mornings before having food, that&#x27;s a few good hours of intermittent sprint type activity.