The Air350 Biaxial Upper Back incorporates a unique design with unilateral/bilateral movement. Designed for superior isolation of the upper back, this machine features an adjustable chest cushion, which helps stabilize the exercise posture while concentrating on the “elbow out” position, to ensure high upper back engagement through the full range of motion. The unique unilateral option promotes symmetry by assuring that the stronger side does not compensate for the weaker side.