The hills they are a'calling

I am fortunate enough to have a lovely national park just near home - a small but steep mountain range. I've been looking for good ways to link together the steep tracks for efficient uphill training and am really happy with this circuit.

A bit under 3 hours, 13km, 20000 steps, 1000m of elevation gain - and nearly 50% more calories burned and exercise load than the same steps on flat ground.