OK, so i've had a few crack at some cat-4 road races and realised i need to get fitter.
I've got a 11 mile (one-way) commute through the countryside. Theres not much traffic, hardly any junctions and no traffic lights.
So whats the best way to use this to get fit for racing?
I can extend it occasionaly in the evenings, but the idea is to not take much time out the rest of the day.