The wealthy are spending hundreds of thousands, and sometimes millions, to build indoor and outdoor pools on their properties ...

Swimply allows users to rent backyard pools by the hour. Launched in 2019, the company now hosts 15,000 private pools in more than 150 cities, according to Bunim Laskin, its 28-year-old CEO.

The indoor pool, called the “Endless Lap Pool,” is on the lower level of the house and is connected to the primary bedroom. In the backyard, “terraced grounds” frame the outdoor pool.