There are 13 people playing basketball, 22 people going out for an outing, 10 people playing computer games and 12 people running.

22 >； 13 > 12 > 10,

Therefore, the number of students in grade three who like outing activities on weekends is the largest, and the number of people who like playing basketball and running is basically the same;

(2) Playing games is harmful to the healthy growth of students, so it is necessary to arrange the online time reasonably; Physical exercise can enhance physical fitness and should be strengthened.

So the answer is: outing; Play basketball, run.