Below are all the skills associated with the Strength ability.
$^1$ A PC can climb and swim under normal conditions without having to make a check; however, strenuous conditions may require that they pass an Athletics check. Each foot of movement during such a check costs an extra foot of movement, or an extra 2 feet if it is considered difficult terrain. Characters with climb and swim speeds ignore the extra costs associated with movement of this type. Similarly, the horizontal and vertical distance a PC can jump without having to make a check is determined by their Strength score and modifier respectively. An Athletics check is generally only required when attempting to jump a distance farther than the amount calculate in the table above.
$^2$ During a vertical jump a PC can extend their arms in order to achieve an extra distance equal to 1⁄2 of their height, which they can effectively add to their jump distance in order to attempt to grab on to a ledge or other handhold.