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(BigL @ Feb. 01 2007,12:49)</div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">Lifting straps seem sort of dangerous, one time I was doing incline dumbbell presses and i caught a sharp pain in my shoulder and I had to drop the weight immediately, if that thing was strapped to my hand who knows what would have happened. It was a 100 pound dumbbell. Probably would have ripped my shoulder out.</div>
I certainly don't claim to be an expert on lifting straps, only having used them for a few months now. But, I believe that you're only supposed to use the straps on pulling exercises such as deadlifts, rows, shrugs, pullups, etc. They help to protect and take stress off of the wrists, enabling you to handle greater weight than you could otherwise lift without them.
This is the only way I use them, and I've found them to be very beneficial. For the reason sighted in the quote above, I don't think it's necessary (and could even be dangerous) to use straps on pushing exercises.