List 3 reasons why someone can become addicted to a substance?

What is an important step to prove something is valid or not? determining the reliability observing research testing

Which of the following can refer to the form of exercises that uses free weights, weight machines. resistance bands, or the weight of the body to put stress on the muscles ? (a) strength training(b)weight training(c)resistance training(d) all the above

John goes running around the neighborhood every day after work what health related factors will he be improving their his types of training