I'm gonna make this short and simple. Look at these 5 movements:
Are you doing these in your workout?
Are you doing this with your legs?
Are you doing this with your back?
Are you making sure you muscles are balanced and not just for show?
Do you want to move better and experience less pain?
If you want to do better and feel better which will make you look better then ask yourself are you doing
A few Examples
Push: Pushup, Bench press, Leg press, Squat, Dips
Pull: Pullups, Lat Pull down, Seated Rows, Bent over Rows, Hamstring Curls, Tuck Jumps
Bend: Supermans, Swings, Squats, DeadLifts, Burpees, Tuck Jumps, Crunches
Twist: Russian Twist, Cherry pickers, Windshield Wipers, Standing Cable turns
Carry: Deadlift, Squat, Bench, Farmers walk, Dumbbell Lunges
Anyway, that's how I look at my personal training and what I coach to others. Usually if they have a old injury or a weakness they've never gotten past the answer is in those 5 movments. Either they haven't done one enough or they've done another to many times. Anyway again. Happy lifting/working out/getting healthy/going HAM.