It’s about how you feel about yourself, and how it effects you.
Ex:
If you have depression your heart is directly effected by what you’re brain is telling you to feel. If someone calls you a bad name / you feel badly about your body, your heart will feel heavy.
Ex 2:
Going on a run..
When you run you automatically feel like a whole new person. Any exercise done right makes you feel like you’ve accomplished something, making your body and emotions feel completed in some way.