Some early feedback:
Background:
I haven't trained anything like this in probably 10 years (high school wrestling). I normally lift heavy with moderate to low reps ( 6 - 10) with 45 - 60 seconds rest between sets and up to 3 or 4 minutes between exercises. Occasionally, I superset smaller muscle groups like bis and tris. Also, I'm coming back from a roughly 3 month hiatus from lifting, using this routine to get back in shape and shed a little fat before I start lifting heavy again.
Feedback:
I've noticed that I'm quickly regaining my strength in the 6 rep sets and even the 12 rep sets but the 25 rep sets aren't moving much. Also, the more the 6 and 12 rep sets go up the harder it gets to complete all 3 sets of each circuit. This makes perfect sense to me. Another point is I decided to try running on an off day last week...I haven't run in a very long time and found that my cardiovascular endurance is WAAAAY above where it has been in a long time...running was almost easy for me...
More feedback later...