Ressy

Someone who goes to the gym during the first part of the year as part of a new year resolution. Usually they travel in packs as ressies. They pack the gym during the first few weeks, but often dissipate during the rest of the year.

Hey, I haven't seen you at the gym before. Happy New Year, Ressy.

Dang, it took for ever to get a on a treadmill because of all the ressies were at the gym.