I am not convinced that a 10 foot broad is particular more difficult then a 30 inch vert, a legit standing 30 inch vert is pretty rare, I have measured that high 4 times during real peaks of my fitness my best broad is 9^9 I know three other athletes who are at 10 feet who are 27 or under on the vert. Small sample and in the parkour community we do allot more standing broad jumps then standing verts as part of our training but the two feets seem similar in difficulty to me.
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