Fastest way? Lift Heavy, almost every day, and devour copious calories, including lots of protein. If you've never trained before, I recommend finding an existing program. 5x5 is simple enough to follow. Pair that with regular meals and a gallon of milk a day (GOMAD) and you shouldn't have any issues. Push your max weight up by 5 pounds each session if you can. Protein shakes help with the calories if you're coming up short, but with a gallon of milk a day plus regular meals, you shouldn't be. Creatine can swell your muscles with water a bit if you're just going for size, and if you're doing your 3 rep max, you might eek out another rep or two. Give muscle groups a break between days, so follow the schedule, or you'll likely hurt yourself.
You can also skip the GOMAD and just plan your meals with a large caloric surplus in mind. If you're trying to look ripped with a 6-pack you'll need really low body fat, <12%, so you'll either need to dial in your calories, or cut weight after.
Also, sleep well, stop smoking and drinking, and don't skip a single day ever unless you're injured.
The only thing I disagree with is the everyday part. Your body needs to heal or you’ll gain much slower. It’s better to work out once a week really hard than it is to do every day. I used to make this mistake. Then I took two weeks off and gained more than I did in months during that time because my muscles finally got to heal. Gains= ripping muscles then when they heal they become bigger/stronger
But right about the rest. You need to drastically up your calorie intake. I’ve done it with a lot of milk. Huge amounts of calories and protein. But if you go that route, invest in some lactase (not lactose) pills. It’s an enzyme that helps break down milk. You can get it anywhere. I got it at Walmart or cvs. If you don’t get it you’ll have the most rancid gas and upset stomach.
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