There is a moment every September when my walking group looks at me with the same question in their eyes. This year it arrived early, courtesy of a viral clip of someone power-walking through a park with what looked like a small sandbag strapped to their chest. Ten texts later, I had my answer ready: yes, the weighted vest is having a moment, and yes, I would find out exactly what it does before any of you buy one. So I did what I always ask my clients to do before they chase a trend: I built a little experiment…
