Long Jump. With a 10 ft. running start, you cover feet up to your Strength score. From a standing start, you cover half that distance.
High Jump. With a 10 ft. running start, you leap 3 + your Strength modifier feet. From a standing start, you jump half that height.
Each foot cleared on the jump costs a foot of movement.
The DM can call for a Strength (Athletics) check to clear an obstacle, land on difficult ground, or jump farther than normal.