Just another boring day & it catch my mind. We have so many frame shape nowadays. From aero, box, semi aero box, oval, etc. The same logic as an airplane need to achieve some speed to make its wing catch the wind & lift its body. Isnt it the same for racket to, for one to be able to get benefit & feel the air cutting effect, one need to be able to swing in certain speed? So beginer with low swing speed wont notice or had any effect if they use aero or box frame racket.