Doing regular exercise or playing sports can be dangerous, ( 1) _________ if you are over 40. ( 2) ___________ it is a very good idea to see your doctor ( 3) ___________ starting if you think you are not very fit. Some people try to do exercise or play sports too vigorously too soon, and ( 4) ____________ they cause themselves injuries ( 5) ___________ can take a long time to heal. ( 6) ___________, it is not only older people who should take care. Doctors report many injuries ( 7) __________ backaches, sprained ankles and pulled muscles, which can all be avoided if a little care is taken. If you do injure yourself, rest for a while ( 8 ) ___________ allow your body to recover naturally. ( 9) ___________, don’t push yourself because you think it is doing you good. (10) __________, you could do yourself permanent damage.