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you could add more of a base, but that would add more of a tripping hazard, you need the 'foot' to be able to roatate to conform to the ground your walking on, if you go too long, and didnt pick your foot up high enough, you may go down.... As far as balance, i've been using these under a costume at the haunted house i work at, i've gotten pretty decent at walking on them, i can jump a little, spin, run, etc, but you gotta be careful, and standing still for more than a couple seconds isnt a possibility, and it IS a leg work out. they may take a little work to get really comfortable and conformed to your legs. You wont be able to take full strength jumps in these, but hopping around a little is ok. Just make sure your crimps are strong.
The No-Weld Double-Barrel Smoker (and how to use it)
Cold Smoker from Cocktail Shaker