Physical activity and discipline to maintain a healthy life with body training to improve your strength and flexibility. It can also have competitive purposes. From Greek 947; 965; 956; 957; 945; 963; 953; 945; ( gymnasia "sports exercise" ) formed by 947; 965; 956; 957; 959; 962; ( gymnós "naked [because the men practiced it without clothes]") - 953; 945; ( -ia "action, quality" ) .