Did you know that your total kilojoule intake has the greatest impact of your ability to lose weight? Exercise alone is not very effective for losing weight. You can exercise till the cow's come home but if you are not making good choices with what is going into your mouth - its like paddling upstream without an oar!
Exercise however is essential for your health and to assist long term maintance or prevention of weight regain.
Did you know that your resting metabolic rate is largely determined by your lean muscle mass? Muscles require a great amount of Kj's to sustain them. That's why weight bearing exercise is soo important if you want to lose weight - you must minimise lose of muscle throughout your life - your muscles are your fat burning furnance.
Plus the upside to lean muscle mass is you will look toned and healthy( and I'm guessing you will walk with added confidence knowing you look and feel fantastic!)