The little know other muscles that could
Often at times we ignore the smaller muscles. What I’ve seen from the pro’s is their attention to detail when it comes to body building, no muscle is small enough or ignored. Under developed delts, forearms, hamstring (men), traps, serratus anterior, calves, and overall legs (men). No muscle group should be igonored and all of them should be trained with equal intensity as you do your favorite body part. It also helps bring that symetry to your body for the coveted "X" frame build. The "X" frame comes from the fact that not all body builders are blessed with great waist lines, its that some flare out their shoulders and quads and give the illusion of a smaller waist. Its all a part of working those little know other muscles. Here are a few of my favorites.
The Serratus anterior:

Forearms:
Reverse barbell curl Palms facing out.
Hamstring:
Barbell walking lunge.
Traps:
Barbell shrugs.
Delts:
Arnold press.
Calves:
Barbell Calve raise.
Leg development:
Front squat, difficult to master but worth the time and effort.
These are by no means the standard bearer of exercises but are some great starters to develop those little known or used muscle groups, that is just my two cents.





