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this is an old trick and was done in the 70s before sports science knows what it does today when you add weight you run the risk of using the muscles differently than they were intended for some, maybe that's not a problem. for others, it will lead to muscles not normally involved with kicking being recruited to help you keep your balance and sling the weight around which will lead to muscular imbalances and injury the chance for hyperextending your knees also increases because the joints were not designed for your foot to weigh 5 extra pounds IF you do this do it very very very sparingly and pay attention to your body IMNSHO it is a too much risk for too little reward kind of thing