If isaiah wants to develop an exercise habit, he needs to work out regularly for
5-10 days
15-20 days
about a month
about a year

15-20 days

Explanation:

It is recommended that to create the habit of exercising, one should exercise 3-4 times a week, this will be around 15-20 days per month. Creating this habit is very important, because in addition to being a healthy practice, exercise promotes greater resistance, disposition and immunity to the body. For this reason, we can say that if Isaiah wishes to make a habit of exercising, he must exercise regularly for 15 to 20 days.