I suspect The Weak Link has never ridden a fixed geared bike. If my local terrain was flat I would give up cycling or move.

Having only one gear and not being able to coast is what makes it fun. It has made me a better, more aware cyclist.

I usually ride my FG bikes on rolling hills terrain.
Standing and rocking the bike to get up the steeper hills is my upper body workout and keeping up with the pedals on a longish, steep descent is a great cardio workout. I try not to use my brakes on the downhills.

I often use my FG bike to go on group rides with other who are on multi-geared bikes w/o any problems. Often after someone has drafted behind me for some time will comment "you have no rear derailleur!".