Looking for a low-impact workout that actually moves the needle? Japanese Interval Walking Training (IWT) might be exactly what you need. Instead of steady pacing, you alternate brisk and easy walking—simple, science-backed, and surprisingly effective. What Is Interval Walking? Fast phase: 3 minutes at about 70% of your top walking speed (a “light jog” effort) Slow phase: 3 minutes at 40% of that speed (an easy stroll) Repeat for 30–45 minutes, ideally 4–5 times per week. Why