The retention rate is the main determinant of a health club’s profits. A very important fact about this relationship is that a change in the retention rate has an exponential effect upon changes in profits – this relationships holds for changes in retention rates in either direction. The chart below is for a fictional health club with a 60% retention rate that is earning $500,000 in annual profits. Note how profits expand for similar increases in the retention rate as the retention rates increase. At 69% an increase to 70% in the retention rate increases profits by approximately $24K, from 74% to 75% yields $50K and from 79% to 80% brings in an additional $62K