Along the same lines (speculatory evolutionary biology?) is the observation that in training for endurance sports such as running, cycling, skiing and rowing we best respond to either long, slow distance training at very low intensities (like in persistance hunting) or high-intensity sprints&#x2F;bouts (like combat) because those were the main &quot;athletic&quot; stimuli for our ancestors.<p><a href="http:&#x2F;&#x2F;www.sportsci.org&#x2F;2009&#x2F;sai.htm" rel="nofollow">http:&#x2F;&#x2F;www.sportsci.org&#x2F;2009&#x2F;sai.htm</a>