12．
| or put try back time every against chair easily relax |
Looking after your back
If you want to have a strong healthy back，you should have good posture（姿势）．You should put the least stress（压力） on your （96）back．If you have good posture，you won't get tired （97）easily；you won't get pain in your back；you will look good!
When you are sitting down，
★（98）Try to keep your back straight．
★Don't cross your legs．
★Put your back （99）againstthe back of the chair．
If you are working on a computer，
★Sit back and （100）put your arms out to the keyboard．
★Bring your （101）chair up close to the keyboard so that you can rest your arms on the chair （102）or desk．Keep your shoulders （103）relaxed．
★You need to rest and move around （104）every 30minutes to let your body relax．
★Try bending（弯） back a few （105）times to help your body relax．
