I hate to tell you but if you aren't sweating a lot you aren't working out. Walking will help get the flab off in a calorie controlled diet but it won't really help you get much fitter. Jogging will but it bores me shitless. The key is finding something you enjoy doing that keeps you fit and doesn't bore the crap out of you. It might be football, basketball, canoeing, skiing, running marathons or martial-arts. Only you can find that out.
Fraser