How do you build 5 pounds of muscle?

Imagine if the devil came along and offered you the following deal:

A life of riches, fame and luxury if you could build 5 pounds of muscle over the next 28 days:

Devil Face

But if you can’t build 5 pounds in a month you’ll lose your job and end up flat broke for the rest of your life (and of course he owns your soul.)

A. Do you take the deal?

B. If so how would you go about building the muscle?

Please answer in the comment section below.