Exercise Wings

Richard Burgess's 1941 patent (No. 2,244,444) describes a pair of feathered wings that could be attached to the arms of an individual, who would then flap the wings up and down. This, claimed Burgess, would create a sense of buoyancy, while simultaneously providing physical exercise. In particular, it would "develop the chest, back, arm and leg muscles, while also tending to create accelerated breathing and thus general physical tone." It would do all this, he said, while also being "very diverting and accordingly attractive."

How did this product never take off?