Jury duty can appear out of nowhere. It can be troubling for those who are on a tight schedule and/or don't feel comfortable appearing for such a task. Does this mean, you will be forced to go as a juror or is there a way out? Unless a 'proper' reason is not cited, you will have to attend jury duty.
What are some of the proper reasons?
Being an expert in the field being discussed (i.e. sports lawyer in a sports related case) would warrant for an immediate excuse. A juror with such close expertise is not a sufficient option and will not be used as their opinion is not going to be free of bias and could hold too much sway in the proceedings compared to other jurors .
Another reason can be proving to the judge, you are not healthy enough to warrant a spot as a juror. This has to be backed with medical certification stating the juror will not be able to attend jury duty .