It’s a terrific New Year’s resolution, but you’ll pay more per visit if you pay monthly, researchers at the University of California at Berkeley and Stanford University concluded after an extensive study. The average member with a monthly membership paid $17 per visit. That’s slightly more than people with an annual contract paid per visit in their first year (people who hung in there for a second year saw their per-visit costs drop significantly), and considerably less than the $10 per visit paid by the average gym-goer in the study who paid by the visit. Plus, people with monthly memberships spend an average of $185 between their last visit and when they get around to canceling those memberships.