The Maverick element of me suggests that the day I no longer 'have to' do any phys is probably the day I buy a pair of trainers. However walking has much merit especially when used in conjunction with a healthy diet. ....and if my garden over the last few days is anything to go by, I will not be short of manual labour in my retirement and I am quite sure I have burnt more calories then sitting behind a PC screen. (Reluctant blunties missing the air beneath his wings).