To improve <span>cardiorespiratory fitness a person should participate in aerobic exersises of moderate intensity for approx. 30 minutes threeto four times a week</span>
Subordinating conjunctions creates a transition between two complex sentences. It indicates the place or time or a cause and effect relationship. Even though, how, if, though, while, although etc. are some of the subordinating conjunctions.
Therefore, the above lines with subordinating conjunction will be written as:
Although the movie was boring, Holly couldn't bring herself to leave the cinema. Her friends then decided to go to a restaurant close by. In the end, Holly enjoyed the evening because they ordered her favorite food—Chinese.
Not something they’re able to get for one another!
The purpose is to help the reader/student/? understand the subject at hand and make it easy to get evidence for your claims/ideas.