Gentle Core Exercises: Start toning your abs, building your back muscles, and reclaiming core fitness today - Harvard Health

Gentle core exercises are specially designed for people who aren't up to tackling regular core exercises, perhaps because they are out of shape or possibly due to an injury or health problem. T

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Core Exercises: 5 workouts to tighten your abs, strengthen your back, and improve balance - Harvard Health

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Core Strength Benefits and Exercises to Improve Your Workout - The New York Times

Core Strength Benefits and Exercises to Improve Your Workout - The New York Times