A gym is a club, building, or large room, usually containing special equipment, where people go to do physical exercise and get fit. … Gym is the activity of doing physical exercises in a gym, especially at school.A gym is a club, building, or large room, usually containing special equipment, where people go to do physical exercise and get fit. … Gym is the activity of doing physical exercises in a gym, especially at school.A gym is a club, building, or large room, usually containing special equipment, where people go to do physical exercise and get fit. … Gym is the activity of doing physical exercises in a gym, especially at school.A gym is a club, building, or large room, usually containing special equipment, where people go to do physical exercise and get fit. … Gym is the activity of doing physical exercises in a gym, especially at school.