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Another commonly held belief is that the warm down after a hard workout or the shake out the next day is important to ‘help get the lactic out of the legs’. However, again the science doesn’t back this up. Yes, walking or jogging does shorten the time it takes for lactate levels to return to normal, but this return to baseline occurs relatively quickly anyway. By the time someone is doing a shakeout the day after a race or hard session, the lactate generated by that effort has long ago left the muscles. And where is it going? This is where lactate being a fuel source again comes into play, according to Brooks, after ‘exhaustive’ exercise lactate then becomes the preferred energy source, being burned up by muscles that are no longer using anaerobic respiration, and by the liver to regenerate glucose.

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