system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Difference between low weight-high rep/high-weight low rep and use in relevant techniques or combinations.
gpt
In a very basic sense, the body adapts to the sort of activity that it thinks it will need to do in the future, based upon past experiences. For example if you are exposed to greater amounts of sunlight then your body will react by increasing the production of melanin which will result in a tan.

If you use relatively lower weight with a high amount of reps then you body will adapt to sustained output, increasing your stamina.

If you use high weight and lower reps (by necessity) then your body will build larger muscles in order to achieve the higher peak output.