text: how to lose fat fast? 1) aerobics 2) weight training 3) both? some ppl say aerobics is best if u keep heart rate in target range, others say weight training is good becoz muscles utilize more calories and increase bmr, some also say a combination of both well, i do know for a fact that a cardio exercise will burn fat. step aerobics, walking on a treadmill, & dance these all burn calories. but you must do a cardio exercise at least 30 min 3 times a week. to see rapid results a hour 5 days a week. the weight lifting also burns calories but also builds muscle. if you eat right & exercise you can turn fat calories into fuel and gain muscle and trim your self. remember muscle weights more than fat. so if you get on the scale and you don't see a dramatic change at first don't get discouraged. if i were you i would do a combo of both cardio for 20-30min then lift for 40-30min. you should notice a change within 3-5 weeks.