One thing you probably know about being fit and healthy is that weighing too much is bad. Well, that's only half true. It's well known that muscle has more weight than fat, and a person with lots of muscle is probably pretty healthy, so you can toss that out the door. What you really have to look at is your form. What is your body built to do? If you have no muscle or fat, then you must be skinny and agile. From here, you can attempt to start lifting weights and controlling your diet to add on muscle mass. If you have lots of fat but no muscle, you might be scared about trying to lift free weights because you will put on extra pounds. Stepping on the scale after lifting free weights for a week to find out you gained ten pounds sounds frightening. But actually, it's probably just the thing you need. How difficult does it sound for a guy who's really fat to drop a lot of weight and at the same time put on some lean muscle without gaining weight? That means going for jogs, swimming, and all sorts of cardio exercises that some extra heavy physiques can't handle. To be able to do things like that, you need to have muscle. Muscle is the tool that will enable you to train harder, faster and longer before you give in. Also, it's not so bad to keep that fat after you put on muscle, as some fat is actually essential for your body, and to a certain point, having a little extra fat is not very harmful to your health.
"Artists are allowed to be a bit different." - Bob Ross