Weight training is synonymous with dumbbells and barbells, but the "O2", an armband-like device, could change all that by letting you lift up to 52-pounds without the use of large equipment.
http://www.techeblog.com/index.php/tech-gadget/o2-magnetic-dumbbells-can-be-worn-like-bracelets-adjustable-to-52-pounds
http://www.techeblog.com/index.php/tech-gadget/o2-magnetic-dumbbells-can-be-worn-like-bracelets-adjustable-to-52-pounds
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