During the year 1930 there was one engine which as on hype named as 'Ricardo' sleeve valve engine. Mirrlees the period introduced two Mirrleesengines represented this patent type of the valve engine. Well the first kind had bore of around 5.5 inches and developed a stroke of just about 6.5 inches and produced 20BHP each cylinder at rate of 900 r.p.m. the other had 17 inches bore and 21.5 inches stroke, giving 50BHP per cylinder on the rate of 200 r.p.m. 5. The concentration of their language Physical fitness as we know it today is miles from which it began. It began as simply survival then converted into preparation for war then began some very early competitive sports. Later it became philosophical since the body was admired for its beauty and strength. For a brief time, the main objective turned to preparation for war and after that it ventured into a medical standpoint as the great things about health and fitness came to light. Then we became sedentary and began to recognize the requirement for physical fitness in different ways. Thoughts on the other hand turned time for competitive sports and, next few centuries, evolved into the present day day revolution that people see and hear a lot about. Physical fitness has evolved in the centuries from basic survival to health awareness. 1. The attractiveness of the person