1) Bent over barbell rows.

One of the best Thickness-builder exercises for the upper back. It’s also good for width and works the lower back a bit too.
The subject needs to grip the barbell with about a shoulder-wide overhand grip. Leaning forward so that the upper body closes a 90 degree angle with the legs he/she should pull the bar upwards to his/her abdomen while keeping the body completely static.
Pausing for a moment he/she should lower the bar back to starting position keeping it under control al the way (not let it just drop)
Extra considerations:
- do not pull the barbell to your chest. Pull it to the abdomen using the muscles of the back and not the arms.
- keep the body steady, get a good lower-back warm-up before the exercise to fend off injury.