A few of the other comments have covered good reasons why this is a poor analogy. One thing to remember: wing muscles are the most well-developed muscles on bir

A few of the other comments have covered good reasons why this is a poor analogy. One thing to remember: wing muscles are the most well-developed muscles on birds, while human arms are extremely weak compared to our legs. A better analogy would be that flapping-wing flight is to soaring how running is to standing (maybe on a moving platform to account for turbulence, etc.).