> The other advantage of climbing to cycling or running is that you'll 
> generaly only have a big fall once.

Then there's motorcycling. It gave me many moderate to somewhat severe 
vertical falls and two rather major horizontal falls. The latter occur 
when either someone adds sudden substantial sideways motion to the 
motorcycle or someone adds sudden cessation of horizontal motion. I've 
had one of each :-). Road motor cycling is not overly calorie 
consuming for the rider but off-road riding can be about as energetic 
as anything else you can do.



        Russell


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