advice on converting mountain bike to fixed gear bike

[cjcanty]

hi everyone,
I was wondering if anyone could give me some advice. I currently own 3 bikes. Two mountain bikes and a road bike. One of my mountain bikes is a trek fuel 100 (which I love) but it means that I never bother to ride my trek 6500 mtb. I am interested in converting it over to a fixed gear bike for winter training to improve my pedaling. What do I need to do to convert it over and about how much would it cost.

Thanks

Colin