Al Roker says this viral walking routine helped him go even farther. Here's how to try it

Weatherman Al Roker tried a Japanese walking workout, which is an interval training method alternating between harder and steady walks to help increase distance. This routine involves warm-ups followed by repeating 3-minute fast intervals and 3-minute easy intervals for a total of 35 minutes. Experts note that this type of challenging walk improves VO2 max, builds bone density, and benefits cardiovascular health.