Sparq (Nike) makes a weighted vest with metal loops that I find easy to use and comfortable for sled work. The vests are light (5-10) and are quick to get on and off.
Costs might be prohibitive if you need alot of them however.
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Working "hard," or the perception of working hard, doesn't really mean anything. Sweating, vomiting, and breathing hard could be a good workout or a tropical disease kicking in.-Dan John
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