Adjust the height of the rings appropriate for your fitness level (the lower the rings the more difficult the exercise).
Grip the rings, keep your body straight and your legs fully extended behind you.
Slowly lower yourself down towards the floor.
When you are at lower position, slowly push one of your arms away from your body. Return your arm back to yourself and repeat with your other arm.
Then push yourself back up to the starting position.
Do not lock out your elbows to maintain tension throughout the muscles during the exercise.