The answer is C. I am glad you quit smoking.
Is it free choice answer or selecting the following?
Answer:
Isotonic contractions maintain constant tension in the muscle as the muscle changes length. This can occur only when a muscle's maximal force of contraction exceeds the total load on the muscle. Isotonic muscle contractions can be either concentric (muscle shortens) or eccentric (muscle lengthens).
Enjoy your day! :D
This would be D. Cross training!
Cross training is when you are trained in multiples areas incase something happens and someone cannot show up for their job.