Here are a few options for a WordPress post tag description for “快速增肥” (kuài sù zēng féi, meaning “rapid weight gain”) in Traditional Chinese, catering to different needs:

**Option 1: Concise and Direct**

* **Description:** 想要快速增長體重？這裏提供實用的增肥資訊及方法，助你達到理想體重。 (Xiǎng yào kuài sù zēng zhǎng tǐzhòng? Zhèlǐ tígōng shíyòng de zēng féi zīxùn jí fāngfǎ, zhù nǐ dádào lǐxiǎng tǐzhòng.)
* **Translation:** Want to gain weight quickly? Here provides practical information and methods for gaining weight, helping you achieve your ideal weight.

**Option 2: More Detailed & SEO-Focused**

* **Description:** 尋找快速增肥的秘訣？我們分享健康、有效、安全的增肥方法，包括飲食建議、運動計畫及生活習慣調整。適合瘦弱人士，幫助你擺脫過輕困擾，達到健康的體重範圍。 (Xúnzhǎo kuài sù zēng féi de mìmì? Wǒmen fēnxiǎng jiànkāng, yǒuxiào, ānquán de zēng féi fāngfǎ, bāokuò yǐnshí jiànyì, yùndòng jìhuà jí shēnghuó xíguàn tiáozhěng. Shìhé shòuruò rénshì, bāngzhù nǐ bǎituō guò qīng kùnrǎo, dádào jiànkāng de tǐzhòng fànwéi.)
* **Translation:** Looking for the secrets to rapid weight gain? We share healthy, effective, and safe methods for gaining weight, including dietary recommendations, exercise plans, and lifestyle adjustments. Suitable for underweight individuals, helping you overcome the trouble of being underweight and achieve a healthy weight range.

**Option 3: Focusing on Solutions**

* **Description:** 想擺脫過瘦的困擾嗎？了解快速增肥的有效策略。我們的文章提供了關於增加卡路里攝取、選擇增重食物、以及制定增重計畫的詳細指南。 (Xiǎng bǎituō guò shòu de kùnrǎo ma? Liǎojiě kuài sù zēng féi de yǒuxiào cèlüè. Wǒmen de wénzhāng tígōng le guānyú zēngjiā kǎlùlǐ shèqǔ, xuǎnzé zēngzhòng shíwù, yǐjí zhìdìng zēngzhòng jìhuà de xiángxì zhǐnán.)
* **Translation:** Want to get rid of the worries of being underweight? Learn effective strategies for rapid weight gain. Our articles provide detailed guidance on increasing calorie intake, choosing weight-gain foods, and creating a weight-gain plan.

**Option 4: For Specific Audience (e.g., Fitness Enthusiasts)**

* **Description:** 針對健身愛好者和希望快速增重的人士，我們提供專業、全面的快速增肥指南。掌握飲食、訓練和休息策略，提升肌肉量，達到更理想的體格。 (Zhēnduì jiànshēn àihào zhě hé xīwàng kuài sù zēngzhòng de rénshì, wǒmen tígōng zhuānyè, quánmiàn de kuài sù zēng féi zhǐnán. Zhǎngwò yǐnshí, xùnliàn hé xiūxi cèlüè, tíshēng jīròu liàng, dádào gèng lǐxiǎng de tǐgé.)
* **Translation:** For fitness enthusiasts and those who want to gain weight quickly, we provide professional and comprehensive guides to rapid weight gain. Master diet, training, and rest strategies to increase muscle mass and achieve a more ideal physique.

**Key Considerations when choosing:**

* **Your Target Audience:** Who are you writing for? A general audience or a specific group (e.g., athletes)?
* **Your Content:** What kind of information do your posts actually provide? (Diet advice? Exercise plans? General tips?)
* **SEO:** Consider incorporating relevant keywords that people might search for (e.g., “healthy weight gain,” “gain muscle,” “increase appetite”).
* **Length:** WordPress allows for longer descriptions, but aim for concise and informative.

No matter which option you choose, remember to make the description relevant to the content tagged with “快速增肥” and use clear and easy-to-understand Traditional Chinese. Good luck!