Some people's bodies just burn more calories in resting than others. Or their resting isn't as resting as they think - look at people who sit but their leg twit

Some people's bodies just burn more calories in resting than others. Or their resting isn't as resting as they think - look at people who sit but their leg twitches up and down. Ultimately it's still calories in vs out. But the out isn't just burning 500 calories running. It's what you burn doing your day to day too.