system
Given the following post, respond as if you're commenting on Reddit:
human
If I'm standing flat on a scale and swing my arms forcing my body down, where does the extra "weight" come from?
gpt
Newtons third law of motion, which basically says that for each action there is an equal and opposite reaction. So lifting your hands/arms up, pushes the rest of your body down, which is recorded on the scales as a momentary increase in weight.