Is Sauna worth prioritizing?

A well-known Finnish cohort study (KIHD) found frequent sauna bathing (4-7 times per week) was associated with substantially lower fatal cardiovascular and all-cause mortality compared with once weekly, a finding extended by related analyses from the same cohort linking sauna use, cardiorespiratory fitness, and reduced risk of sudden cardiac death. Weighing that against the numbers, Sauna is worth watching rather than prioritizing yet — the potential upside is rated high (62/100), but the evidence supporting it is only moderate (72/100).