Here are a few options for the WordPress post_tag description, keeping in mind SEO and clarity:

**Option 1 (General & Concise):**

> 解釋貓咪的活力水平、活動量，以及如何促進和維持牠們的健康活力。了解貓咪的日常活動和遊戲，包括各種品種和年齡。

**(Translation: Explains cats’ activity levels, how much they move, and how to promote and maintain their healthy vitality. Learn about cats’ daily activities and play, including various breeds and ages.)**

**Option 2 (Focus on Behavior & Health):**

> 探索貓咪的活動力與行為之間的關係。了解活力不足的貓咪可能潛在的健康問題，以及如何透過飲食、環境豐富化和玩樂來提升貓咪的活力。

**(Translation: Explore the relationship between cats’ activity and behavior. Learn about potential health issues in cats with low vitality, and how to improve their activity through diet, environmental enrichment, and play.)**

**Option 3 (More Detailed & Keyword-Rich):**

> 在這個標籤中，我們會深入探討貓咪的活動力，包括不同年齡、品種的貓咪活動需求。 探討如何觀察貓咪的活力水平，以及如何透過玩具、遊戲、貓薄荷以及其他方式來刺激牠們的活動量。 我們也會討論過度活躍或活動力不足(例如是否需要就醫)的情況。

**(Translation: In this tag, we’ll delve into cats’ activity levels, including the activity needs of cats of different ages and breeds. We’ll explore how to observe a cat’s vitality, and how to use toys, games, catnip, and other methods to encourage their activity. We will also discuss situations of overactivity or underactivity (e.g., whether medical attention is needed.)**

**Option 4 (Simple and SEO-Friendly):**

> 貓咪活動力相關資訊。 遊戲、運動、健康。

**(Translation: Information related to cats’ activity. Play, exercise, health.)**

**Recommendations for Choosing:**

* **Consider your audience:** Are they beginners or experienced cat owners?
* **Think about keyword optimization:** Include relevant keywords like “貓咪 (Mao Mi – Cat)”, “活動力 (Huo Dong Li – Activity level)”, “健康 (Jian Kang – Health)”, “遊戲 (You Xi – Play)”, “運動 (Yun Dong – Exercise)”.
* **Keep it relatively short:** WordPress tag descriptions should be concise and to the point.

You should aim for readability and clarity for the best user experience, while also making sure your description can potentially help with SEO. You can mix and match elements from these options to perfectly fit your needs.