A normal person with Strength d4 and Dex d4 has a move of 8 yards. Their vertical leap is 2 yards? That's a lot of air, even in Jordans. Is the idea that you jump and grab, so your height and reach are part of that 2 yards? Even so, a d8/d8 is possible for starting PCs, leading to a 4 yard vertical leap ...
Correct on all accounts. Your vertical leap is what you can jump up and grab. The methodology is designed to be fast and simple. So, yes, a character with d4/d4 - low average - isn't much of a jumper. While a character with a d8/d8 could grab the top of a 12' wall and haul themselves over. A character with d6/d6 - high average - could dunk a basketball on a successful Athletics check; it would be easy - no check - for the d8/d8 character who is highly athletic.
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