Does Zone 2 actually make a difference, or is it overhyped?

"Zone 2 training" (low-intensity aerobic exercise performed just below the first lactate/ventilatory threshold) has become a popular longevity concept, but the best current evidence is considerably more skeptical of the specific claim than the popular narrative suggests. Weighing the data: Zone 2 looks an early-stage, lower-priority area for now — the evidence is only emerging (38/100), and its estimated impact (22/100) is on the lower end too.