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Personally i find walking (briskly) but at a pace you can manage,little and often is great, (if you dont have a dog to walk,and tou dont particularly want one,volunteer for the elderly is a good or dog rescue centers are always happy for you to take any of there dogs out for whatever length of time you can manage,(dont go for a massive high energy dog though!!) you probably have more time on your hands slowing down with your work or career ,with your condition,so try not to just stop doing anything and everything this is a sure way to become worse (i know this from my own experience) and you never know rescuing a little four legged friend may just rescue you back.