Personal trainer gym rental Upper East Side, NYC. CorefitnessNYC is the go-to private training gym, located at 12 East 86th Street in the Upper East Side near Central Park and major transit. Designed for high-conversion client sessions, this clean gym, offers elite equipment, consistent availability, and zero distractions. With flexible hourly and monthly rental options, no revenue splits, and transparent pricing, fitness trainers keep more of what they earn. Whether hosting one-on-one or semi-private fitness sessions, CoreFitnessNYC supports growth, retention, and client results in a premium gym location. Book online and train your gym clients on your terms in NYC’s top personal trainer gym rental space.