Why do Cheerleaders counts 5,6,7,8 and not 1,2,3

Question

Why do Cheerleaders counts 5,6,7,8 and not 1,2,3

In: 871

Answer 1

I always counted 1, 3, 5, 7 during a routine allowing time for the even numbers to be counted internally, but I always started 5,6,7,8 in practice setting since this allows everyones internal rhythm to sync up before initiating whatever movement we were practicing that starts on the count of 1. This could be deviated from depending on what weirdness we were doing.