Instruction How your forearm length affects your swing May 24, 2017 1 of 3 ...score a point for gliding. A longer forearm tends to elevate the club to a more upright position at the top, requiring glide to lower and slot the club coming down. 2 of 3 ...score a point for spinning. In these screens, any 'neutral' test result is a match for using rotational force as your primary swing engine. 3 of 3 ...score a point for launching. A shorter forearm tends to create a flatter position at the top. Only by launching can you create the steepness you need to catch shots flush.