If cold, wet weather threatens to dampen your outdoor running goals, dont sweat it. Do this 25-minute leg-strengthening circuit indoors instead. The lunge and plank variations help work leg, butt, and ab muscles that running overlooks — so youll.

If cold, wet weather threatens to dampen your outdoor running goals, dont sweat it. Do this 25-minute leg-strengthening circuit indoors instead. The lunge and plank variations help work leg, butt, and ab muscles that running overlooks — so youll.

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