Hi Dr hurst mines a simple one, i am new to the cycling game and would like to no how many miles do i have to do a day for my muscles to start toning, i aim for between 5 and 8 miles a day at the moment, and should i change my diet at all, i have also just given up smoking and am constantly hungry is this because i am doing more excersise i am 8 stone 6 so dont want to lose weight but after having 4 children am a bit soft and flabby.