I rent out my backyard pickleball court to strangers. I've brought in $1,600 this year and even hosted a proposal.

Courtesy of Michael Thompson

This as-told-to essay is based on a conversation with Michael Thomspon, a retired San Diego teacher who built a custom pickleball court and listed it on the Swimply app. It lets homeowners rent out their pool, courts, and other amenities by the hour. The essay has been edited for length and clarity.