You can sit on it at work, but take this ball – heavier than a standard physio ball and cloaked in antimicrobial material – into your gym for great core workouts aided by the extra density. [$225; technogym.com]
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Action-Packed Summer Trips
Race Dune Buggies, Explore Italy, Bike Yellowstone
Plus: Fighting Poachers and Oil Companies in Congo
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Nick Offerman's Life Advice
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