Dumbbells are a convenient and versatile exercise tool. You can do most any strength exercise with a pair of dumbbells. With this versatility comes a higher risk of injury. Dumbbells allow you to move in any path. You are responsible for controlling the weight and performing exercises with proper form to reduce the risk of injury and increase the effectiveness of your workout.
Significance
Dumbbells are a functional strength-training tool. The movements you do with dumbbells simulate everyday activities, unlike a weight machine, which locks you into one movement pattern. Although dumbbells are functional and versatile, this freedom of movement results in more responsibility for the lifter. Performing dumbbell exercises with improper or sloppy form can cause injury and a reduction in the effectiveness of the exercise. Although each exercise is different, follow some basic guidelines for proper body alignment.
Upper Body Alignment
Think in terms of straight lines and right angles when analyzing your body position for dumbbell exercises. For seated and standing exercises, keep your back straight and your neck aligned with your spine. Don't excessively arch or round your back. When doing presses, hold the dumbbells so your elbows are at a 90-degree angle. Maintain a wrist-elbow-shoulder alignment when possible. For example, when doing a barbell curl, your elbow should be directly below your shoulder, not forward or in back of it. Your wrist should be straight, not curled.
Lower Body Alignment
The same general guidelines apply for lower body dumbbell exercises, such as squats, lunges and deadlifts. Keep your back straight and bend over at your hips, not your waist. Align your knees with your second toe during lunges and squats so your knees track with your ankles. When descending into a squat or lunge, stop the movement when your thighs are parallel to the ground. Do not push your knees forward past your toes. Unhinge at your hips first by shifting your hips backward and allow your knees to follow their natural path.
Considerations
These are basic guidelines; they are not written in stone. You need to allow for individual differences in limb length, mobility, flexibility and biomechanics. For example, the American Council on Exercise notes that although you shouldn't actively push your knees past your toes when lunging, if you have long limbs, your knees will likely push past your toes a little. Certain exercises require you to round your back slightly or otherwise break these alignment guidelines. Learn the proper form for each specific exercise in a way that works for your body.
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