As a working mother of two, Dr. Leslie Bottrell has little time for exercising, let alone getting herself to a fitness studio in her Upper West Side neighborhood for a group class. And because her schedule varies week to week, she can’t settle into classes with fixed time slots anyway.

So when Mirror — the streaming fitness device with a Hollywood following — was installed in the yoga studio of Dr. Bottrell’s apartment building, 222W80, it quickly became her go-to exercise solution.

“It gives me the benefit of a class,” she said of Mirror, which looks like a standard looking glass until activated, when it reveals an instructor who takes you through a fitness regimen of your choice. “But I don’t have to go out and find it and fit it in with my schedule.”