CrossFit is measurable, repeatable, results.
The happy people do. That is who.
CrossFit makes us happy repeatedly. If we didn't we would stop coming. Like Pavlov's dog, shock me enough times and I learn not come back. Obviously the WODs are terribly hard and push us to our physical limits. Of course our heart rate jumps when we see our fate written on the white board. But the short term discomfort of working out is far out weighed by the longer term benefits.
See photo above