Assertion: sandbag | /r/CapableOf | offer specific training feedback
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text: Sandbags offer a specific training feedback called ‘dynamic variable resistance,’ which means that the resistance or weight—in this case the sandbag—is always changing slightly (or greatly) as you move the bag,” says Andy Speer, CSCS, trainer at Performix House in New York City and Peloton Tread instructor.