Wow, 85 pounds, thats fantastic well done!!
I think the key to exercise is finding something you enjoy doing - that way it isn't a chore. I love swimming and go everyday for half an hour.
If you enjoy it, then it's easy. I hate exercise machines, so only use them if I've hit a plateau to kickstart the weightloss again.
sw: 221 lbs
cw: 156 lbs
tw: 140 lbs
65 pounds gone for good