From cheerleading to Glee-themed classes, there isn’t a fitness gimmick unturned in this town. But for those who are looking to get back to workout fundamentals, the Fitness Cell Collective has opened a 3,000-square-foot studio in midtown. The founders, three longtime personal trainers, one of whom was a lieutenant in the Israeli Special Forces, have taken their fuss-free exercise philosophy and applied it to a group setting. Hour-long classes ($50 for single classes, unlimited memberships from $1,150) involve grueling sequences of squats, planks, kettle bells, and rowing, and max out at twenty people, reducing the risk of injury and, of course, opportunity for slacking off (328 E. 61st St., nr. Second Ave.; 212-988-8578, fitnesscellcollective.com/wordpress).