How often do you change Loading Sets

[Altamir]

its so confusing. I bought the ebook today and still trying to figure it out.
before you get to the main sets...do you do warm up with lighter sets ??? im so lost.

thanks

Absolutely you warm up with lighter sets. Book is only showing "working sets". How you warm up is a personal preference, but there are quite a few threads on the board already about it if you have further questions. Should be able to find them pretty easily with the search function.