Everyone loves max-out days at the gym. These days are usually saved for the end points of training blocks and programs. The chance to test your strength and skill can seem very tantalizing because it gives you the opportunity to display the result of all the work you have done. While this is a normal time to use rep maxes, it is not the only use for them. Rep maxes can serve many purposes in a program. Whether it is to get an idea of how you are reacting to the program or indicate that you need change, rep max testing can give you a glimpse of how well or not well your training is going.