At my dojo, anyone over 16 is allowed to attend night adult classes. They are great because to a degree we get to do what we want to. I go four times a week to the dojo for about an hour on average. We stretch out on our own first and then salute in (we don't bow, we cross our arms in a downward motion with a loud kiai). Then depending on what we want to do and who is teaching the class we work on katas, sparring, breaking, judo/jujitsu teqniques, weapons, groundfighting etc.