You know a powerful physique when you see it from the back. Lats, Traps, erectors, thickness, etc...
Most are into the mirror muscles, like we all were once as a kid.
Once that focus is dropped (by most people probably in their mid 20's) the real strength will tehn come.
Squats, Bench, Rows, DL's, OHP. The big-5 for strength & power...
Posing your guns and most muscular is fine (mirror muscles), just doesnt mean much when it comes to strength & power...