Which of the following is not true of exercise machines? a. most exercise machines are expensive to purchase individually. b. most exercise machines require spotters for safe operation. c. most exercise machines require less skill to use than free weights. d. most exercise machines can only be used for a limited number of exercises.

The correct answer will be option-C

Explanation:

Exercise machines are now widely used to train muscles either in gyms or at home as they are easy and safer to use.

The exercise machines cannot be used without taking training from the experts as using the machine in the correct way requires the expert skills.

The user must be aware of the concept of how the machine helps the exercise training as well as the movement of the body parts one must make while using the machine.

Thus, Option-C is the correct answer.

answer; i do believe that the correct answer is (b)

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 .