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When a weight lifter holds barbells above his head, he uses his muscles to contract and generate force, allowing him to lift and stabilize the weight. This involves the activation of various muscle groups, such as the deltoids, triceps, and core muscles, to perform the work of lifting and holding the barbells overhead.
The weight lifter needs to apply force to the barbells and move them over a distance in the direction of the force being applied. Work is calculated as force multiplied by distance, so by exerting force to lift the barbells overhead, the weight lifter is performing work against gravity.
The weight lifter would typically use muscular force generated by their muscles to lift the barbells, as well as gravitational force to overcome the weight of the barbells as they move upward.
To effectively perform the standing dumbbell French press exercise for targeting your triceps and improving upper body strength, start by holding a dumbbell with both hands above your head. Lower the weight behind your head by bending your elbows, then extend your arms back up. Keep your core engaged and focus on using your triceps to lift the weight. Perform the exercise with controlled movements and proper form to maximize its effectiveness.
Skaters hold their blades to perform more difficult extensions. Grabbing the blade and lifting it above your head is a sign of flexibility.
The force exerted by the weight of the air above is called atmospheric pressure. It is the pressure exerted on Earth's surface by the weight of the air in the atmosphere above it.
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The force exerted by the weight of the air above is called atmospheric pressure.
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To properly perform a single dumbbell pullover across a bench, lie on a bench with only your upper back supported, hold a dumbbell with both hands above your chest, lower the weight behind your head while keeping your arms slightly bent, then raise the weight back to the starting position using your chest and back muscles.