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Book through the UG app before you go — the schedule shifts week to week, but $30 gets you into any single class.

boxingHiit · Southold

Underground Training

Small-group HIIT studio tucked behind the post office on Main Road — Body Sculpt, Kettlebells, TRX + Core, LIFT, The Circuit and BOSU classes, plus private and private-group training. $30 for a single class; class packs and the live schedule are in the UG app. Classes run early-morning weekdays and weekend mornings.

@_underground_training

Call Website

Address:: 53345 Main Road, Feather Hill Unit 10-1, Southold, NY 11971
Hours:: Mon-Fri mornings 5:30a-11:30a (varies by day), Sat-Sun 7:30a-9:30a
Drop-in:: $30
Schedule:: View classes

Source: Underground Training — Class Details page (class types, drop-in price, address, phone). Google Places: OPERATIONAL, matching address and phone.