We know what to do when the Air Quality Index is high: stay indoors if you can, keep outdoor activities short and consider rescheduling outside events.

But what to do at work or other indoor public places? What is the etiquette of hats indoors? — Patricia, Manchester Township, N.J. To wear or not to wear a hat indoors was once a very simple ...

Learn when to skip the heat, exactly which workouts to do indoors on the treadmill, and what workouts you can keep to the outdoors with a few adjustments.