Soekarno-Hatta Airport Layover: Gym, Spa, or Jakarta Adventure?

Planning a trip with layovers can be tricky! I've got a 7-hour layover at Soekarno-Hatta International Airport (CGK) in Jakarta, Indonesia, on my way from Lombok to Abu Dhabi.  A shorter 4-hour layover awaits in Abu Dhabi. My main question: is it worth venturing into Jakarta itself, or should I stick to the airport?  I'm looking for ways to maximize my time.  Specifically, I'm curious if there are any gyms or spas at CGK accessible to transit passengers.  The thought of a quick workout or relaxing spa treatment is very appealing after a long flight from Lombok!  However, I'm also considering exploring Jakarta – perhaps visiting some of the city's vibrant markets or experiencing its unique culinary scene.  The potential downside is Jakarta's infamous traffic.  Is it realistically feasible to leave the airport and return within 7 hours, considering travel time and potential delays?  Has anyone successfully done this?  Any recommendations on how best to spend a layover in CGK would be greatly appreciated!  I'm also open to suggestions for other airport amenities to help make the most of this extended layover.  Travel tips and insights are welcome!  This is a popular question among travelers, and I'm hoping to find some helpful answers that will help other travelers plan their own layovers at this busy airport.  Many travelers find themselves in similar situations, facing the dilemma of airport relaxation versus city exploration. I'm particularly interested in hearing from those who have experience navigating Jakarta's traffic during a layover.