What is the ruling on practicing water polo if the training is three or four times a week?

Sports are a means of strengthening muscles and protecting the body from diseases. One must adhere to the Sharia guidelines therein, such as covering the 'awrah, not neglecting duties, and avoiding unlawful mixing. If one abides by these guidelines, there is no objection to practicing water polo or other sports for the aforementioned number of times per week.