&gt; Sample size of one: I just started to &quot;get fit&quot; after 10 years of sitting on my ass.<p>As a contrast, I&#x27;ve been fit all my life (two sport college athlete, resting heart rate in the 30s) and I absolutely cannot imagine sprinting without a warmup.<p>GP, how fast are you? 100m time? I have never, ever seen a coach or trainer recommend anything other than a long slow warmup. As someone who has a chronic hamstring injury, warmup is crucial to any exercise that I do.