Rob Poulus seems to be a fan of power block dumbells . Here a snap shot of the dumbells he talks about..
Quote from From the merchants website
“PowerBlock is the only dumbbell system that can expand to meet your strength needs. Start with a 50 lb set, expand to 90 lbs, expand again to 130 lbs. Dumbbells are the most versatile and effective exercise tool ever developed for strength training. Now you can have rapid access to a whole rack of dumbbells at home in the space of just 1 pair, and at a fraction of the price of conventional dumbbells.”
After having a look at the website it does look promising !
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