nothing wrong with a tread mill, its just good to note that just because you can run 10k on a tread mill doesn't necessarily mean 10k off it will be just as easy ;)
I prefer swimming for cardio, but when i'm training for triathlons or marathons running is a must.
try some cycling shorts for the 'small hard seat' on the bike. You can get mountain bike ones that are loose if you don't feel comfortable wearing spandex of course!
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