I did not use any of the spa services, but did use the gym facility here which is covered in the resort fee at the NY NY. They make you sign a waiver before entering.
The gym is pretty basic, but serviceable. Several cardio machines, treadmills, machines, free weights and fitness balls. They have a water cooler and towels for you to use for your workout. I like that they have wipes to clean the machines once you finish using them.
Also, there are locker room facilities next to the gym if you need it. The gym was pretty empty. Seems most people are walking around on the Strip, gambling, drinking or lying poolside. If you want to get a regular workout, this place is fine. I paid for it, so I had to use it. But pales in comparison to a regular fitness club.