walking is great. I also use a stationary exorcise bike to help burn away the bulge. I find it's a lot more forgiving on my joints than walking. Some people find it a little boring but I usually blast music and sing along to keep myself entertained (which also boosts my endurance for my lungs which is great since I have asthma so every little bit helps) Also free weights are great, just don't over do it with them, start out with a weight that you're comfortable lifting without injury. It's the high reps that will help to burn fat and build lean muscle, not necessarily the weight of them. Good luck
