It takes some effort but it keeps you healthy and makes your muscles stronger.
Hint: https://www.youtube.com/watch?v=7UGu2sRmSHI&pbjreload=101
exercise
You have to do it every day. It marks the days end and beginning.
Sleep
It's fills your stomach and gives you energy.
Hint:
This is what you do if you're enjoying being not alone, usually with those you care about.
Spend Time with others
Sit quietly and focus on your breathing.
Hint:
Meditation