I suggest playing games inside. Or maybe walking or jogging around the school to get your exercise in.
Is this what you meant?
It is a simile because your comparing two things
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Explanation:
On this special day, I will highlight the major achievements for the year, and I hope I will do justice to all of them. The large number of students, who will receive prizes today, is a clear testimony that this year has been the best year ever for the college in terms of academic and cultural achievements.