WHAT DOES IT MEAN WHEN A CLOCK ICON AND NUMBER SHOW UP ON THE BOOKING SCREEN?

When you see a Number and Clock Icon next to a class it means that class has a waitlist associated with it. The number represents the number of people currently on the waitlist. If you click that icon, you will join the waitlist. Once you join the waitlist, the icon will turn into a blue circle with the number that represents your current place in line on the waitlist.