A version of this article first appeared in CNBC's Inside Wealth newsletter with Robert Frank, a weekly guide to the high-net-worth investor and consumer. Sign up to receive future editions, straight to your inbox. Equinox's $40,000-a-year membership has a waiting list of more than 1,000 people, as demand for luxury health and wellness programs soars, according to the company's chairman. The high-end fitness chain's "Optimize by Equinox," launched in 2024 , is one of the most expensive gym