Just started the 20 Minute Muscle Builder routine this past week.
It seems like you could run this program indefinitely either as-is, or as the core of a slightly longer program. However, because the 15-20/AMRAP set progresses a bit faster than the top sets, eventually your top sets won't have the same training effect.
Is this something to approach as: "do for 6-8 weeks, retest maxes, repeat", or should another strategy be taken, like a break to higher intensity "strength" work for a bit, then come back?
I'm obviously a long ways from that point yet, but just wondering.