Acer Extensa 4220 - 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 67 in the AcerSystem User's Guide.