You got lots of good advice in this thread. I've been from little to big to sort of big to massive down to sort of big and back up to big, and I know that when I was at my heaviest exercise intimidated the crap out of me. Everyone said "oh, just walk!" like it was the second coming, but it was hard to explain that even that was too much for me. But something was better than nothing, so I started parking farther away at the store. Then on a nice day I walked the two blocks I could, and maybe helped my boyfriend in the garden. Or vacuumed. Or put on some great music and danced around like a dork while I was making dinner. None of it was really intentional exercise, but it was enough to start building back up my stamina.
Yoga was my first "official" exercise in years, and I can't tell you how absolutely amazing it is. Even if you can't do all the poses, or even most of them, it's great for getting your stretch on. I did it every morning at 309 lbs and even though I wasn't doing it well, I go to the point one day where I didn't totally suck.
The gym started very slowly for me too -- my friends (you know, the skinny annoying ones with expendable income) were all "GET A PERSONAL TRAINER!). a) with whose money? and b) uh, no. I was not ready for someone to get all Jillian Michaels on my as&. Instead I started slowly on the treadmill, maybe 5 minutes at 1.9 miles/hour. That turned into a 5K a few months later.
I'm back at the gym now 5-6 days a week -- just came home from one of the hardest workouts I've ever had and I feel great. I'm in no way in shape or even kinda not fat now, but I'm getting there. And it all started with just moving more, whatever that "more" is for you.
And word, word, WORD on water workouts. Gentle on your joints, and with a really great instructor it's an amazing way to exercise.
Hang in there and find what works for you. No way's wrong -- it's all about committing to something you feel comfortable with.
Good luck!
