The practical route
Treat bulk and cut as goals inside Ultimate Gym Game. The public Trello says bulking is a fast way to gain muscle or strength, maintaining still gains while keeping a lean physique, cutting gives 80% less muscle gains, and deficit is similar to cutting but not ideal for getting lean.
This guide does not prescribe real-world diet, exercise or supplements. It uses the Trello as game evidence while telling players to recheck the current interface after updates.