Are you up for eight straight hours of fitness activities? Or maybe you'd rather just take a class or two, or try something new? The Nu'uanu YMCA will present Group X-athon, an eight-hour fitness event, from 8:30 a.m. to 5 p.m. Saturday.

There will be continuing classes in TRX boot camp, Turbo Kick, cycling, Drums Alive!, cardio kickboxing, yoga, Pilates (below), hulaerobics and much more. It's a fundraiser for the Y's youth programs. A $25 donation gets you into any and all classes. Open to YMCA members and the public. Anyone can register in advance or just show up on Saturday with a donation. Registration: 536-3556 or information: 541-5243. Nu'uanu YMCA, 1441 Pali Highway.