Starfield:Weight Lifting

Weight Lifting is a novice tier physical skill that increases your maximum encumbrance. The highest level also gives you resistance to stagger.

Skill Increases
As the challenge describes, simply go near your maximum capacity, and sprint. Preferably do this in a large space when it will be easy to keep sprinting.

These skill challenges can potentially be increased concurrently with some other skills, such as the Fitness challenges.