What would happen to you if you ONLY trained your upper back and posterior chain (ie. the opposite of the ‘mirror’ muscles most people seem to focus on)?
We all know people that do too much benching, and (if they train their legs at all) focus too much on the quads over the posterior chain end up with rounded-forward shoulders (shoulder problems) and anterior pelvic tilt (back problems). It seems like the mirror muscles can become your curse if you work them too hard.
Imagine if your routine would be like;
Weighted inverted rows
Deficit sumo deadlifts
Barbell hip thrust
Can you ever get imbalanced by making your back too strong for your chest and/or your posterior chain too strong for your quads?
What posture would a guy doing the above routine end up with? What would he look like? Would he end up with any imbalance problems?
Guys like Bret Contreas have long advocated doing 4:1 pulling to pushing exercises - so this is taking it to the extreme and doing 4:0 pulling to pushing.
You might not achieve as much mass as you could possibly get, but would you have the healthiest body ever in terms of mobility and joint health?
EDIT: you probably would get big biceps from doing this routine (and biceps are a mirror muscle), but since biceps assist the upper back, that is unavoidable.