system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How is it that losing 1kg of bodyweight reduces the load on your knees by 4kgs?

Where is all that extra weight coming from?
gpt
When you step on some weighing scales the pointer goes past your weight and then back down doesn't it. But the pointer can only show how much force is being pushed down on the scales. So when we step on something the force we land with must be higher than our weight.