I used one of these recently, and way so amazed I came here to talk about it.
Personally it didn't really feel much harder and the end result was a lot better (the week before I was showing no improvement, gaining some fat, now it's gone!)
I had been researching these things for a while. Most places only do 10kg vest but I found a really great place. eBay Seller: backcaredirect: Sporting Goods items on eBay.co.uk
The day a child realizes that all adults are imperfect,he becomes an adolescent;the day he forgives them,he becomes an adult;the day he forgives himself,he becomes wise. A. Nowlan
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