假设你是红星中学的学生李华，请按照以下四幅图的先后顺序，用英文写一篇周记, 记述上周六你和父母一起参加奥林匹克森林公园健步走活动的过程。
注意：1．词数不少于60；
2．周记的开头已给出，不计入总词数。

Last Saturday, I went to the Olympic Forest Park with my parents to take part in an activity called “I Walk, and I’m Fit.”
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