" NGR (No Gym Required) Shoes Price: $160

The idea here is simple: Extra weight equals a tougher workout. Equipped with removable 1.5- to 2-pound midsoles, NGRs burn up to 50 percent more calories than a normal shoe.

Pros: Sleeker look, additional fitness videos on the NGR website

Cons: Heavy to transport, can’t wear (when weighted) during all activities (e.g. driving)

Final take: They added oomph to lunges, and our legs were sore after just one workout."

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