Health Capital
The asset every other asset depends on.
Strength, sleep, mobility and metabolic health compound exactly like interest: invisibly for years, then all at once. Unlike money, it cannot be raised quickly, borrowed against, or bought back at a premium later.
A strong position looks unglamorous - resistance training you don't skip, sleep protected like a board meeting, bloodwork you actually read.
A first depositTwo strength sessions a week, in the calendar, treated as unmovable.