Need advice

I am only 3 weeks post op from a gastric bypass. Right now I am just walking a few miles every other day. I was told not to do aerobics until 6 weeks post op. So how can I bump up my physical fitness?

 If you're 3 weeks post op, you should really be focusing on recovering from a major surgery. Don't worry about bumping up your fitness quite yet. 

6 weeks is probably a good point to start increasing your workouts - slowly and gradually. 

Now would be a good time to sit and think about some fitness related goals - what do you hope to accomplish? Once you decide that, we might be able to give you a little better advice on what to do. 

just keep walking for now.  i walked consistently everyday for at least 30 minutes, after i felt stronger (4 weeks or so) i was walking a bit faster and longer, but still taking it fairly easy.  after 6 weeks i was cleared by my surgeon for all exercise at that point i started to hit the gym and incorporated strength training.  keep it up, 6 weeks will be here in no time and make sure you are consulting your medical team with your goals.

Walk everyday.

Thanks for the advice. I will just keep walking for now and set some physical fitness goals for later after 6 weeks post op. I am planning on joining a gym and getting a trainer (so I don't end up hurting myself) :)

I agree with everyone else. Walk every day and allow your body to fully recover. You have a lifetime to gain your fitness back and maintain it, do not jeopardize any of that for the sake of impatience :)  Congrats on your surgery, it's an awesome journey...