Running is good for the cardio fitness to keep oxygen flowing on the hills, but walking up the hills with a pack is the best way to build the muscle strength/fitness for it. So do both, playing sport also helps with all round fitness and the competition helps keep you motivated. Biking is a good low-impact alternative to running if you have dodgy knees or something as long as you remember to push yourself instead of just cruising.
I should do all of the above more often than I do but I'm a lazy bugger, and I should eat less pies but I'm a greedy bugger. This weeks goal: get back into biking to work instead of driving.
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