The best protection is to avoid outdoor exercise when pollution levels are high.

The athlete could not find a way to stay in shape with outdoor exercises.

Any outdoor exercise, the details will have to be worked out, but she's amenable.

He appeared as a man who had spent long hours in the saddle or at vigorous outdoor exercise.

Military training, including weapons instruction and outdoor exercises, began in the schools.

He needed more stimulus, either through medicine or outdoor exercise.

"Then outdoor exercise is what he needs," Locke said shortly.

By the 1880's, some girls' schools and colleges were even promoting outdoor exercise.

And at the same time they could be getting regular, outdoor exercise.

Some elderly family members had even ceased their outdoor exercises to avoid seeing neighbors.