Don't try to be healthy, try to be strong or try to do an ultra - or even crossfit. Community & nutrition usually follow IMO.
I think that setting goals like "do an ultra" is more likely to have people stop entirely rather than downgrading their goal to something more doable when they hit that first roadblock.
Better to start small and catch the running bug than try to do something that the vast majority of the population will never even aspire to.