This vest has changed not only the way I feel about cardio, but also my results! No matter if I'm walking, running, cycling, or doing HIIT I'm burning a significant amount of more calories than before - and I've tracked! This vest allows me to do more in the same amount of time or less than, which I value as I've been very busy lately. I get excited to put it on everyday just knowing how good I'll feel post-workout - It never gets old!