I just received this a few days ago and used it in the deep water of our pool for about one hour. Wow! What a great workout! I am waiting for orthopaedic surgery on my knee and can't run on land so I thought I would try this with the aquajogger 'booties'. They work great! I've trained for and completed 4 full and 6 half maratons in the past 3 years and didn't want to lose my fitness. The aqua jogger fit belt and aqua jogger booties are a great pair! This "fit" belt definitely fits a women's shape much better than the classic belt.