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When I accepted the review of the $19.99 Renpho Smart Jump Rope, nothing could prepare my calf muscles for the punishment they would endure while I tested the device. “Pfft,” I thought, “skipping is easy.” Well, how wrong could I be? Very, it turned out. Skipping is a punishing exercise, but it is also an excellent cardio workout, and I knew it would be a great facet to add to the post-COVID lockdown exercise regime I’ve undertaken recently, to shift some additional timber and get my fitness back up to scratch.