The body row is a great pulling exercise which can be performed with a set of rings, a barbell on a squat rack, or at a park on a set of low parallel bars. Set the bar/rings/TRX at a height that allows the arms to be fully extended with the shoulders barely raised off the floor. Bear in mind that the higher the bar, the easier the exercise.
Lie on the floor, bend the legs so that the shins are perpendicular to the floor, and feet and toes remain flat on the floor. Reach up grab the bar, starting with your arms full extended and your glutes activated. Maintain your body in a straight line from your knees to the top of your head
Pull your chest all the way to the bar (or between your hands if using rings or TRX) thinking of squeezing your shoulder blades together. Slowly lower yourself to the starting position maintaining good spinal integrity. Repeat
To increase the intensity:
Lower the bar or rings so that you are closer to horizontal (greater effect of gravity)
Extend your feet further away from your body
Perform the exercise one legged
Place your feet on a box or swiss ball