Well, that depends on what you mean by "fast."
Increase the protein in your diet. Work out with weights. To increase muscle mass you want to stick with heavier weights and less repetitions (lighter weights and more repetitions will tone, not increase, muscle). You should give your muscles two days of rest between workouts. Lifting every day will not make you stronger faster. It will make you sorer faster, give your muscles less time to recover and all of that will make you give up faster.
Don't bother with expensive "muscle building powders" endorsed by bodybuilders. That's just protein in powder form. And stay away from steroids.
Make sure that you do the reps and don't worry to much about the weight . You have to do the most weight you can do for less reps. No more than 8 reps but preferably 4-6. And yes protein, that is what feeds your muscles if your muscles cannot eat they WILL NOT grow. One more thing and I cannot stress it enough, creatine WILL help! You do not need to buy the fancy stuff. Take it with Grape Juice!
For more in-depth information about how to gain muscle fast, and for the free programs and plans to get you started or to take you further, see the page links, further down this page, listed under Related Questions.
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With a little intelligent bodybuilding training, you can build muscle mass and gain weight fast.
low reps, high weight
You don't gain weight in order to get muscle. You overload your muscles with heavy weight training, and then eat more to fuel the muscle growth.
When you order a steak, is it weightless? No. Of course your weight goes up when you gain muscle.
Answer: Your frame size will become larger so you will gain weight, but not from muscle mass. You can gain muscle mass from exercise.
weight gain powder gives you more muscle.
No that is impossible. You cannot gain muscle mass without ever gaining weight.
Yes, you will gain weight in muscle.
I need to gain weight, how can I do it fast and healthy?
No
Yes, because as the size of your muscle increases, the mass of your muscle increases. And when the mass of your muscle increases, so does the weight.
It depends if you get fat then go on a diet, or if you lift weights, you gain muscle,and muscle weighs more than fat.