- the pinnacle of years of running and months of hard training. Richard DonovanThe first person in the world to run a marathon at both the North and South Poles, Richard Donovan has also claimed gold at the Inca Trail Marathon, the South Pole Marathon
wouldn't do a 25-30 mile run every weekend and feel fine the next day. – debboYou can't compare them except in terms of general exercise in a given HR zone for a certain time. You can't say "OK I have done 50 miles of cycling so that gives me 'x' miles
