system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 if standing up straight is supposed to be proper, why does slouching seem so natural?

I try and stand/sit up all the time but it always feels forced while slouching just feels right and comfortable. How is that?
gpt
Proper posture is better for your body in the long run. Slouching feels easier because you're using less muscle to stay upright. But decades down the road, slouching may be your only option if you don't avoid it now.