猪八戒跟着唐僧从西天取得真经回来。一路上，猴哥斩妖除魔，筋斗云帮了很多的忙。因此，猪八戒非常羡慕猴哥的筋斗云，便央求猴哥，教他筋斗云功。猴哥笑着说：“老弟，你这么胖怎么能学习筋斗云呢？”猪八戒知道，猴头这么说，是要他减肥，便早早告辞猴哥，独自一人去找减肥 Pig along with the monk from the Western won the Scriptures back. Along the way, the monkey brother demon demons, tendons cloud a lot of help. Therefore, the Pig is very envious of Monkey's tendon clouds, they begged Monkey brother, teach him to do battle cloud power. Monkey brother said with a smile: “My brother, how can you learn such a fat belly clouds it?” Pigs to know, Hericium so to say, is that he wants to lose weight, he would soon leave the monkey brother, go alone to lose weight