In Focus:

The Abs-Tightening Workout You're Not Doing—But Should Be

The abs are your body’s built-in way of stabilizing itself. When you remove balance points, your abs will always engage. Try it! Go from standing on two feet to standing on only one. Notice how your abs turn “on.” How about going from kneeling on “all 4s” to extending one leg or arm out. Hi, abs! Now try getting into plank on toes and elbows, turning to one side, and lifting your top foot and forearm (shown below).

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