Acer Aspire 9920G Series User Manual page 12

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Developing good work habits
Develop the following work habits to make your computer use more relaxing
and productive:
Take short breaks regularly and often.
•
Perform some stretching exercises.
•
Breathe fresh air as often as possible.
•
Exercise regularly and maintain a healthy body.
•
Warning! We do not recommend using the computer on a couch
or bed. If this is unavoidable, work for only short periods, take
breaks regularly, and do some stretching exercises.
Note: For more information, please refer to "Regulations and
safety notices" on page 86 in the AcerSystem User's Guide.