Sitting at a computer for long periods oftencauses neck and shoulder stiffness and occasionally lower back pain.Do these stretches every hour or throughout the day,or whenever you feel stiff. Photocopy this and keep it in a drawer.Also,be sure to get up and walk around the office whenever you think of it. You'll feel better!
1. added a preview function, user can complete overview of action.
2. modified to help show the location of the former aerobics display by default.
3. in the interface to add a voice control switch
4. modified BUG because timer is not allowed to rise to the question prompt.