A muscle pump implant or MPI is a device implanted in the abdomen that can regulate muscle hormones, blood flow, and various other bodily functions, to give the user the ability to promote muscle growth to a ridiculous degree. It can be more effective than steroids, with minimal drawbacks. The muscle pump implant can be turned on and off, at will by the user. Side effects for muscle pump implant may include: extremely increased appetite and lengthened sleep cycle.