They can from exercises that effectively build muscle such as weight lifting. Obviously, you aren't going to gain weight from body fat. :P
One can build a muscle fast by doing the following steps; weight lifting, forcing the body to adapt or progressive overload, hypertrophy training or muscle growth training and by compound and isolation exercises.
Weight lifting is probably one of the best exercises to help you build muscle in your upper body, which in turn will build up your strength. You should aim to do weight lifting only one or two times a week, making sure to rest on in between days.
Muscle training is lifting weights and weight exercises
Weight training is the best way to build extra muscle and body size.
They don't help build muscle, but they do increase your intake of protien which is what your body needs to build muscle.
You can do exercises that work that area of your body, such as lifting weights or riding a bike.Running and Biking.
When you do your work out , you do not gain weight , your body uses it to build muscles.
Your height and other factors such as your body build(muscle mass) contribute to the ideal weight for your age. Most are about 155 pounds, though it will change drastically according to what kind of activities you do, such as weight lifting, sports, etc.
Failure is the point at which a muscle is no longer able to perform the work demanded. If a muscle is capable of lifting 100 lbs, 10 times, it is said to fail at that weight after 10 reps.
mass xxx to gain weight and build muscle
Physical training is weight lifting, jogging and muscle toning, basically anything that pertains to your body