Cross-training involves all of the above. It involves exercising in a variety different ways in different sports. Hope this helps! :)
A healthy amount of exercise helps to maintain a healthy respiratory system. Therefore, the answer is D. reading a book
you can also use test taking skills when answering this question by concluding that reading a book is most different from the other choices that involve exercise.
Answer:
i know one but im pretty sure its false
Explanation:
Pollution would be a good example for it
