People join fitness clubs because they are concerned about their health. Membership in fitness clubs is the only means by which consumers demonstrate their concern for fitness. Renewal rates at fitness clubs are not increasing. Additional unstated assumptions might occur to you as well. You can take any one of these assumptions and draft it as the best answer choice for any of the three question types.
People join fitness clubs for the primary purpose of socializing with other club members.
The argument can be either weakened or strengthened, depending on whether and of these conditions have changed and, if so, the direction of change. In unstated-assumption questions, look out for the answer choice that turns one of the argument's unstated assumptions on its head. Membership fees at fitness clubs have been increasing overall during the past year. Perhaps you're wondering why these answer choices wouldn't jump off the screen at you as obviously wrong. Well, it's remarkably easy under the pressure of the timed GMAT to inadvertently turn either the argument, the question, or an answer choice, on its head.