<span>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. </span>
Answer: progressive resistance exercises.
Explanation:
Progressive resistance exercises are the exercises that are performed to increase the muscular strength of the body. In these exercises the participants exercise their muscles against a resistant surface or object. This process increases the strength progressively. The material used in progressive resistance exercises includes the machines, elastic bands and free weights. These type of exercises involve both concentric and eccentric contractions.
I think its called Escherichia Coil. hope this helps:)
