Can I omit buổi here?
Yes, you can.
Would it be acceptable to only use "chạy" as verb, and not using "chạy bộ"?
I am curious of the use of bộ as well.
Sometimes you can, yeah.
What does chai bo mean???
Is there any difference in meaning between sang and buoi sang?
I would like to know what chai bo means. Is the "bo" necessary?