#1 Calf raises work which of the following muscles: A. Obliques
B. Gastrocnemius
C. Trapezius
D. all of the above

#2 Lunges target which of the following muscles:
A. Quadriceps
B. hamstrings
C. Gluteus Maximus
D. all of the above

#3 Interval Training means:
A. Incorporating a variety of exercises into your workout routine
B. Alternating short bursts of intense activity with active recovery
C. Strength training alternated with cardio exercises
D. Exercising for 10 minute periods multiple times a day

#4 Knee flexion during strength training should be at an angle greater than 90 degrees.
True or False

for question 8

1: it gets the blood pumping more

2: endorphins and other neurotransmitters

since you have not provided the options here i   am going to give you general overview about hormone.hormone are actually the part of endocrine system in our body and produced by the endocrine glands. the hormones act like a chemical messenger   within human body. once produce by the glands they   travel through the blood stream and reach at specific or target tissue and organs   which result in control of our body function. the hormones are specific in their work and work on only the targeted tissue or organ   . with the of hormone endocrine system regulate the heart rate , metabolism, our mood and   growth as well as the development and even the sleeping cycle etc. they actually are the messenger for body cell and organs .