Also, it is crucial that students arrive 5 to 10 minutes before each class. Arriving right at the start time of the class usually results in the student entering after the class has begun. Being late causes the student to miss important information about the class, and often struggle to get focused on the class afterwards. It may also cause them to miss part or all of the warm-ups, resulting in little or no preparation for the more intense exercises and greater risk of injury. Late arrivals tend to disrupt the class, too, which is inconsiderate of classmates and instructors.
On the flip side of this, unless specifically instructed, students should not arrive too early either, especially younger students. There is preparation to be done to get the space ready for classes, and arriving too early can cause disruption. Also, often, if younger students have to “wait too long” they lose focus during their actual class time. Doors typically open 10-15 minutes prior to the first class starting time and students shouldn’t expect to enter the dojo prior to this.