So i'm wondering why some people say that I should seperate weight training and cardio days, i'm trying to lose fat and build muscle, but right now i wanna focus on losing the fat and toning up, im about 30 pounds overweight if that matters at about 25% body fat, if that makes any difference. I just wanna know the chemistry behind working out, like what is ur body doing right after a lifting session or cardio session, and what it does for the rest of the day, and what exercise routine (eithere seperating cardio and weigh ttraining, or doing cardio every day) would help me lose the fat the fastest, in say about 3 months without losing any muscle