It was the perfect workout. Sheryl Olitzky did two sessions at Mayweather Boxing and Fitness in North Brunswick and thought she found a winner. “I really liked the gym,” she said. “It was clean and the instructor was attentive. I was only able to go to two classes. Both classes were great and gave me a super workout.” After the two classes, a back injury that was unrelated to her workouts took her out of the ring. Olitzky’s back was treated with injections at the Spine Institute of New Jersey in late September 2023, and she received a doctor’s note explaining she had to stop her remaining sess…