Regular physical activity plays a key role in keeping your lungs strong.

It is also important to note that in all these activities only a minority played active roles.

Similar spontaneous activity in the cortex may also play a role.

Their only recreational activities are playing cards and watching television.

Over the past 5 years or so traditional cultural activities have played a large part in the life of the club.

It has been shown that sexual activity plays a large part in the interaction of social species.

The Earth's climate is changing ever faster, and human activities play a role in speeding up this change.

Mental activity may also play a factor in perceived temperature.

Sporting and cultural activities play a important role in the festival.

After school activities played an important role in the study.