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Your bodyweight is enough to build muscle mass, trust me. I am talking about real massive muscle mass. Gravity is a gigantic stimulus when used correctly. All you need to know is how a goal oriented hypertrophy program creates intense impulses to your muscle tissue. You've got resistance bands at hand? Handy, but not necessary.
There is no doubt that I recommend going to the gym. But if you've got a pretty damn good reason to train at home, this program will lead the way to nothing less but glorious success.