If they constantly pushed themselves to the limit, they would put dangerous stress on their muscles and joints and risk their career.
فلو بذلوا يوميا كل ما لديهم من طاقة لألحقوا الضرر بعضلاتهم ومفاصلهم وعرّضوا مستقبلهم المهني للخطر .‏