FORT LAUDERDALE, Fla. (AP) — Are some workouts, like yoga or spinning classes, less safe than others? Should I wear a mask? Do I need more than six-feet apart in cardio classes where there's panting and heavy breathing?

There are many legitimate concerns about how gyms and fitness studios can safely reopen without furthering the spread. But infectious disease experts say risk can be greatly mitigated by following some simple rules.

"There may be scenarios where (the gym) can't develop a system whereby your risks are lower, so the responsibility falls to you," said Dr. Deverick Anderson, direct...