Compléter SCIENCEVersion en ligne LET´S PLAY! par Jasone Musgo 1 dancing calcium broccoli elasticity muscles dog dairy joints sleep HABITS sardines milk illness happy HEALTHY In order to keep our nervous and locomotor systems healthy we need to have healthy habits in our daily life . Physical activity includes not only playing sports , but also other activities such as walking the , or using the stairs instead of the lift . Physical activity helps our locomotor system stay in shape by developing and strengthening our muscles and bones . Playing sports involves sudden movements . This can cause injuries to , , ligaments and tendons . In order to prevent sorts injuries , you should always warm up and do stretching exercises before and after playing sports . As we grow up , our bones , grow . Bone growth requires mainly and vitamin D . Calcium and vitamin D are found in and products ; in oily fish , such as and salmon ; and also in some green vegetables , such as . In order to look after our nervous system , we also need to . Lack of sleep can affect growth and cause . Leisure time helps you to relax . It is also essential for a healthy and life .
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