I’ve used a weighted vest for a couple of years and it’s provided a huge benefit to my workouts. You can use it during running, interval training, or even lifting. I use it mostly during interval training, finding that it supercharges the workouts, especially push-ups and pull-ups. I personally don’t run with it on due to possible joint issues, but many people do.This is my third weighted vest in 3 years and it’s definitely my favorite for a couple of reasons. First, the weight comes from steel See full review