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Originally Posted by Same54321
Hey
My friend told me that spring bac insoles only add the 2-3" to your vert if you jump once then straight away jumping up again will give you the extra 2-3" but you won't get the gain on the first jump. Its a bit confusing but thats what he said.
IS this true?? as if it is i wnt get them
thanks
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youll get some inches, i got 3 but youll probably more likely run faster.