No that is impossible. You cannot gain muscle mass without ever gaining weight.
from sweating and gaining muscle weight
Yes. Swimming builds a lot of muscle, and muscle weighs more than fat. Don't worry if you are gaining weight because of swim team, you will still be healthier and look leaner and feel better.
Exercise at times can definitely make you gain weight especially if your workouts are mainly muscle building instead of cardio. Muscle weighs more than fat so sometimes gaining weigh isn't such a bad thing, especially if its muscle. In the long run gaining a few pounds of muscle is very beneficial towards you because the stronger your muscles are the faster and easier it will be to burn calories.
well, you can go to a class for ab workouts. pushups also help your arm strength as well.
move more and eat less
I would go into a store such as Max Muscle or GNC and ask them what they suggest is the best method for gaining weight. They will have products for you to buy.
muscle weighs more than fat. your weight may not change because you are gaining muscle mass, which weighs more.
Stop exercising them. The muscle will atrophy. (Also, you'll probably lose weight rather than gain it; muscle is more dense than fat.)
You might be eating a little too much. This is happening to me! i think you are building muscle through the excersise, you maybe losing inches though. Building muscle is better because it means you will use up more calories doing everthing even sleeping!
You can be losing fat and gaining muscle at the same time, bringing your weight up. This is not necessarily bad at all. You may be getting quite a bit healthier losing the less dense fat and gaining healthy, toned muscle.
Well, I would recommend exercising daily or regularly for longer periods of time to ensure gaining weight on the body, but not fat. That way, the person is still healthy.