A. test used to measure flexibility
b. the elasticity of muscle groups
c. test approved by the president of the united states
d. measures muscular endurance
e. measures muscular strength
f. measures coordination
g. the ability of muscles to perform work over time
h. the capacity of muscles to generate amounts of force in a short period
i. the body's ability to do several different tasks at one time
j. the ability of the heart and lungs to be active over a long period of time

I found the terms somewhere else and the correct matches are as follows:

1. Presidential Physical Fitness Test
C. Test approved by the President of the United States 

2. Muscular endurance
G. The ability of muscles to perform work over time

3. Muscular strength
H. The capacity of muscles to generate amounts of force in a short period

4. Cardiovascular endurance
J. The ability of the heart and lungs to be active over a long period of time

5. Flexibility
B. The elasticity of muscle groups

6. Coordination
I. The body's ability to do several different tasks at one time 

7. Curl-ups
D. Measures muscular endurance

8. Push-ups
E. Measures muscular strength

9. Sit and reach test
A. Test used to measure flexibility

10. Shuttle run
F. Measures coordination

Muscles in the body us with a lot of things for example, if i wanted to lift a heavy box and had no muscle i would just collapse where i was because of the fact muscles hold us together. overall they are 650 muscle in the human body, all of them have different purposes and ways to keep us together. there are three types of muscle in the body skeletal, smooth, and cardiac muscle. skeletal muscle are attached to the bone and with movement. smooth muscle, this is found in the wall of our organs, such as our stomach, this muscle with movement   as well, without this muscle, we would only be allowed to eat small amounts. the cardiac muscle is the heart muscle and probably the most important one. these are only found in the walls of the heart and the heart pump blood to the other parts of your body. we have two different types of muscle fibers, slow twitch and fast twitch. slow twitch muscles enable long-endurance feats such as distance running. fast twitch fatigue faster but are used in powerful bursts of movements like sprinting. there are three different types of muscle contractions concentric, eccentric, isometric. concentric contraction causes muscles to shorten, thereby generating force.   eccentric contractions cause muscles to elongate in response to a greater opposing force. isometric contractions generate force without changing the length of the muscle.: //athleticquickness.com/muscle-contraction-types-part-1/

1. the answer is a parasite