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Made mine yesterday. Very easy! I can't imagine ever being able to destroy this thing either, unlike the expensive sandbag I bought. Might make a fun video of exercises...if and when I'll post it on my site accessible through my username on the left.
I watched that first video yesterday; very interesting. My thoughts:
Finding a car inner tube can be a challenge these days. I see that the old inner tube for floating is now a brand new plastic thingy in the stores!
Did anyone catch what size he used? He zoomed in on the label but then right back out.
If you aren't into that 40-55 pound range, probably a motorcycle tube would be better. This is about as large as they ever came: http://cgi.ebay.com/ebaymotors/BIKEMASTER-MOTORCYCLE-INNER-TIRE-TUBE-3-60-4-10-19-TR6_W0QQcmdZViewItemQQ_trksidZp3286Q2ec0Q2em14QQha shZitem3ca49e065cQQitemZ260459857500QQptZMotorcycl esQ5fPartsQ5fAccessories
If that link doesn't work, just do an eBay search for motorcycle inner tube, look for the 19" one.
I'm thinking that the handle can be improved by putting a section of 1" or larger dowel inside up to the nylon tie strap, then another strap or two at the lower end of the dowel, around the dowel.
This looks like something I should do. Would fit my so called life style and budget.
OTB, you're right about the handle. Mine is a primitive first version, I'm sure people will improve the design dramatically. However, the way I did it works great and I haven't had any exercises where I wished for something different.
The size was a 15" car tire. I could see somebody throwing this in their car and going to the beach or park for a workout. There's not a part of your body that can't be worked with this thing. Mix some sprints into the fold and you've got a complete workout. You could do the same with just your body too but it's fun to make new toys.