Comment by kccqzy

For me I don't think walking 20 minutes a day is enough. I did more than that right after graduation. It didn't change any of the metrics usually used for measuring healthiness: my resting heart rate didn't change, my VO2max didn't change, my weight didn't change, etc. it was when I started regularly running 2 hours per week (aka around 20 minutes per day) that I started observing my health improve. YMMV.