Hi, I agree with b3n, my husabnd and I have almost finished a 3 month training program which follows similar advice. If by "getting buff" you mean better muscle definition we were advised to increase our protein intake ( we were told that the ideal should be 1g of protein per kg of body weight). This was to aid dropping body fat. We have followed a 6 day program alternating between cardio days and weight training days. Massive increase in protein ( we mostly now eat lean chicken and fish ), followed by a rest day were we are allowed to eat as we pleased ( but not to excess). It has worked for us as we have dropped nearly 8% body fat though our weight has remiained the same. We completed this program though under supervised nutrionists and trainers so if you are are able, ask you physical education teachers at school, they may be able to give you more specific advice or a local gym. Best of luck