As some have mentioned, ABBH is 23 days long (it just fit better that way in the year-long plans). Plus, it's always good to switch things up every 3-4 weeks.
As for the shoulders: trust me, you'll get plenty of shoulder work in any of my programs, even if it doesn't appear that way in the exercise descriptions. It's not a good idea to perform direct shoulder work in addition to the pressing/puling volumes that I prescribe in my programs.
5 years from now, your shoulders will thank me.
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