I need to win an argument about fixed gears

I'm pretty sure the lazy 'letting the bike push your legs around' is better than freewheeling, as I tend to get less lactic acid build up ( I may be imagining this).

Spot on.

Shite.

I was counting on this to get me up the last 2km of the mountain climb I'm doing in 10 days. I figured spinning out at 41:23 for a few km, on the slight decline leading to the steep last 2km, would at least keep the dredded lactic acid out of my muscles.