3 ms·But the minimal dose of cardio is something like 180 minutes a week of zone 2 exercise.by hollerith 1y agoBut the minimal dose of cardio is something like 180 minutes a week of zone 2 exercise.jebarker 1y agoFor sure, but when I was a runner that got me outside for more like 10-15 hours a week.hollerith 1y agoAh. I see now.