> Sample size of one: I just started to "get fit" after 10 years of sitting on my ass. As a contrast, I've been fit all my life (two sport college athlete, res

> Sample size of one: I just started to "get fit" after 10 years of sitting on my ass. As a contrast, I'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. 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.