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Your strength. Good news: all you need is frequent exercise to maintain muscle strength and mass. At any age. Like all fourth-Mondays-of-the-month this year, today comes with a simple program of Ways to increase your strength.

Started the year out on the edge, finished out in the cold. Now's the time for the resolution: be in shape to hike or run more trails in 2018. Press Play for Persuasion.

Great for your triceps, shoulder and core muscles. In between your five-minute stretches of walking or running in place on your step deck. A simple, cheap and tiny object that lets you exercise aerobically in a few square feet. C'mon, sweat a little.

Press Play to see how you can use a Step Deck or Balance Board for an aerobic exercise that strengthens every muscle in your body. Like you're scrambling up a really steep slope, with your hands on the ground. And the ground's moving.