Re:Build some muscle (Score 1)

That's the exactly same response I usually get in Real Life. The reality is that muscle mass translates into more calorie expenditure at rest. Unfit people that struggle to run for 10 minutes will be burning hardly any calories doing aerobic exercise, so weight training is a critical component of any exercise program. The great irony of aerobic training is that the calorie expenditure only really becomes substantial enough to cause weight loss *after* the individual is already fit enough to maintain it for a prolonged period. That's not to say that aerobic training isn't important... but most people greatly underestimate the importance of weight training. (Girls especially, in my experience. "But I don't want huge arms!", they say.) For weight loss I would prioritise diet, weights and cardio, in that order. All are important.