Begin seated with XerTube under feet.  Adjust the resistance of the tube by widening the distance between your legs, and/or criss-crossing your tube.  Grip the XerTube and pull with both arms simultaneously straight back so that your elbows are shoulder height, and stop when they have reached the point perpendicular to your body, squeezing shoulder blades together.  Release the tubes forward while maintaining an upright posture and resistance.  Repeat.

Model: Lynda Davis