Correct the faulty parallel structures:
1. A beginner runner should keep three things in mind: the warm-up session, the time you are running, and the cool-down period.
2. Running, an outstanding form of exercise, can be good for you mentally, physically and it can be good for your emotions.
3. Never start a run without first having warmed up through stretching exercises.
4. Stretching before a run reduces muscle stiffness, decreases the possibility of injury, and it is a good method to gradually increase the heart rate.
5. If you have been inactive for a long period of time, you can't expect to lose weight, to increase heart and lung capacity, and that you will wind up feeling better all overnight
6. An adequate cool-down period allows times for the body to relax and the normalizing of the heart rate.
7. Trying to realize that it was only a machine, Tina sat down in front of the computer, took a deep breath, and was sending her resume.
8. People adopt roles in life which they are most comfortable with, or will benefit them the most.
9. Whether to get a tan, to read a book, or going cycling were some of the tougher decisions Chris had to make over summer vacation.
10. He says that when he grows up he wants to be a teacher, a homeowner, and travel.
11. They say in Arizona that men tear down nature's mountains, run them through mills and smelters, and out of the waste new mountains are built.
12. Cassie was undecided whether to go white water rafting or to camp.
13. The strikers had tried shouting, threats, and pleading.