Pre-School classes are conducted weekday mornings, early afternoons and evenings as well as on Saturdays. The ages 2 1/2-4 classes have a maximum of 6 students per instructor in a 45 minute class. Students ages 4-5 1/2 are in one-hour classes with no more than seven students per instructor. These junior gymnasts are instructed in all the olympic events plus the trampoline using age-appropriate equipment and teaching techniques.   Instructional gymnastics classes take place weekday afternoons and evenings and on Saturdays. Students ages 4-up may enroll in one hour classes. Students ages 6-up may enroll in one or two hour classes. There are no more than seven students per instructor in one-hour classes. Instruction for both boys and girls classes covers the respective Olympic events: floor exercise, balance beam, uneven parallel bars, and vaulting for girls; floor exercise, high bar, parallel bars, rings, pommel horse, and vaulting for boys. Trampoline skills are practiced as part of each class for both boys and girls.   Rhythmic gymnastics classes are conducted weekday afternoons and evenings and on Saturday mornings. This beautiful and elegant Olympic sport is for girls ages 5-up who love tumbling, music and dance. Each student learns to use five apparatus - the ball, hoop, ribbon, rope and clubs.