I finally got my pair of Weighted belts from the Fitness Depot last week and practiced while having them both on a few times. They are not very comfortable but that's all you get. Each belt weights 8 Lbs. so I got two because I needed a total weight of 7.5 KG at least. That's close enough. I at times feel a bit of pain on my knees when I'm running but it's not bad overall. I wish I had them years ago. They for sure help a lot to increase the performance. I tried them on last weekend on a track and after just 4 laps in the first day and 5 laps in the second I was out of breath but then I tried a teardmill yesterday without having them on and it was like I was flying!