A pair of notched shorts has a front and back panel coming together at each side with a seam. The lowest inch or so of the seam is left open allowing a V shaped notch to form.
Split running shorts have curved front and back panels that overlap, front over back and are stitched to the waist band. Usually there is a depth of stitching holding the two panels together for a couple of inches or so for modesty, though running shorts sold in sex shops may lack this.
Split running shorts allow greater freedom of movement and give the impression that you might just be able to see the side of the ass, but quite never can.
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