Walking is an aerobic type exercise. You will burn a few extra calories during your walk but this is very insignificant in comparison to the benefits of a good resistance training programme. (For example a typical hamburger contains about 350 calories but to burn this off you would need to walk for 67 minutes or jog for 32 minutes or play tennis for 49 minutes!). To boost your metabolic rate you must firm up muscle tissue-most people call this toning up. This can be done with weights or body resistance exercises. With a faster metabolism you will find it easier to stay lean and in good shape and you will also have more ‘get up and go’.