10,000 Double-Unders in 30 Days, There’s Still Time

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by Sydney Devine Every year, functional training brand RPM Training Co. hosts a 10K Challenge benefiting underprivileged youth across the world. The challenge is fairly simple: Participants have 30 days to complete 10,000 jump rope double-unders or jump rope single-unders through Feb. 2.  During last year’s challenge, thousands of participants…