There are kid playgrounds because it’s good for children’s social, emotional, and physical health. The government pays for them so they are free. Why aren’t there free adult playgrounds to help maintain good social, emotional and physical health?
All the closest things I can think of (sky zone, ropes course etc) you have to pay for!
The parks around my area have work out equipment for adults, as well as basketball courts, tennis courts, and fields for soccer, baseball, and football.