-twitch muscle fibres. A brief stint in a high gear recruits fast-twitch fibres that have been passive. Just 100m can be enough to revive you.Open a GapWhen you surge mid-race, only you know how long it will last. This uncertainty can unsettle your rivals
as they want for the first 15 seconds of a race without suffering any ill effects. This is true - but only if the race is 15 seconds long. That's because you have only 15 to 20 seconds worth of phosphocreatine in your muscles to use for sprints. Once you
