system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does our heart not ache after an intense cardio session at the gym the same way other muscles do after a workout (example, quads after a leg day)?
gpt
The heart muscle is a different kind of muscle than that in your legs (which is called skeletal muscle). Skeletal muscle gets little tears and repairs itself/gets bigger in response to intense use. Although it's not known exactly what causes muscle soreness, this is probably a big reason. It would be bad if heart muscle did the same thing in response to being used more. More muscle in the heart actually means it is *less* able to push blood.