Jumping Speed (5e Variant Rule)
From D&D Wiki
A jumping speed is an additional form of movement which supplements the forms of movement listed in the SRD. It is intended to help stat creatures that can make incredible leaps, often further or faster than they can walk.
A creature that has a jumping speed can use all or part of its movement to jump. For every foot of its movement allowance that the creature spends, it can jump up to 1 foot horizontally and up to six inches (1/2 a foot) vertically without needing to make an ability check. The creature's jumping distance is not halved when it makes a standing jump. Additionally, a creature with a jumping speed subtracts its speed in feet from the height of a fall for the purposes of determining how much falling damage it takes.