Which of the following is an example of a concentric contraction?

dance move
injuring a non-dominant muscle
bicep curl
slowly putting a heavy object down

An example of concentric contraction is doing a biceps curl. The curl exercise is targeting the biceps muscles on the front of the upper arm and only several muscles assist during the movement. Moreover, concentric muscle contraction is a type of muscle activation that increases the tension on a muscle as it shortens and this activation begins the process of muscle strengthening and hypertrophy.