based on number of dives made per week / month ? - Numbers can vary from month to month, year to year. What is a dive? 20mins vs 3 hours? 20ft vs 140ft? How can one quantify this?
based on number of fitness session made per week / month ? - Not everyone does just gym. In some cities people walk for miles, in some cities people ride cars. Some have a job at a desk, others have a physical one. If you add 1 hour of gym, how is this a same for both?
based on previous SAC history ? Like many have good historical data..
BMI sucks if you have a lot of muscles, it counts against you.
I keep telling you, I got this.