They are. Fit people are generally just better than unfit people in almost every way. More physically capable, fewer heath issues, more energy, more attractive,

They are. Fit people are generally just better than unfit people in almost every way. More physically capable, fewer heath issues, more energy, more attractive, more disciplined, more intelligent and so on. Some of those are probably not entirely causal, for example bad health can prevent exercise. Lower intelligence is correlated with obesity. Getting fit takes discipline but it also builds discipline. So yeah I'm pretty sure that if you compare 1000 fit people and 1000 unfit people you'll see a very clear difference in happiness, health, success in life etc. We're not made to be sedentary.