interval training is good, but not fun in any way whatsoever. if you can do it, great. for example:
1) walk to the first streetlight, jog to the next and sprint all out to the third.
2) repeat until you've had enough.
if you don't like that (and i sure don't - it hurts) then go with jogging and swimming, as suggested above.
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pain is inevitable but misery is optional - stick a geranium in your hat and be happy
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