Self induced, temporary shock and sometimes even sudden pain.
This is true for the things we know are most beneficial in our lives; gym, a diet, a good budget plan. Temporary deprivation for much longer lasting and beneficial gains. I found this to be the case with my experience of an ice cold plunge pool.
When I exit the metal freeze bucket to my new found freedom, I gaze over the hot jacuzzi. Approximately 20 people occupying every corner and prolonging their inevitable exit.
Synonymous with most pleasures of contemporary society; an overindulgent meal, mindless drinking, excessive spending. All intensely pleasure-able at the time, near enough instant regret once over, and no long term benefit.
Plunge pool your way to long lasting pleasure.