9. requires the body to hold a fixed position for an extended period of time so the muscle tissue does not stretch, bend, shorten, or lengthen.
O Concentric contraction
Eccentric contraction
Isometric contraction
O Basic contraction

The answer is Isometric contraction

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there

because health skills are tools and strategies and also practical skills are also something you need to learn (like tools and strategies) and put it in reality.