interesting take scrap. and you're right. that's why they're useless, imo. when you hit them fast you're not even really watching the bag. it's just a blur and your hands are where they need to be based solely on timing.
about the only time I hit a speed bag is when a hot chick walks in to our gym. lol.
although, I did have an idea last night on how to make it worth while. I'll try it tonight and let you all know.
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