Like millions of other people, physician assistant Aki Ohinata gets bored with exercise. But instead of longing for a comfy couch and a bag of chips, she prefers a bigger challenge and a shot of adrenaline. That’s how she ended up getting her workout while dangling 20 feet in the air. For an hour and a half a night. Four nights a week.

Ohinata, who works in Gastrointestinal Medical Oncology by day, is an aerial dancer by night....