COMPARE
PopulationAdults with regular daylight exposureAdults building an aerobic base alongside strength work
EvidenceSTRONG · MODERATEMODERATE · MODERATE
RiskLOWLOW
TimeframeYears. This is a long game with a visible payoff.Eight to twelve weeks, several sessions per week.
The decisionThe single best-supported daily skin intervention. Boring, proven, cumulative.Sustainable by design. Intensity low enough to repeat tomorrow is the point, not the compromise.