Anchor Arms are inflatable muscles that SpongeBob uses only in the episode MuscleBob BuffPants. He bought them because he was tired of Sandy's exercise program. He saw a shark (named Donald) on TV with Anchor Arms advertising the product. It showed the shark before he got Anchor Arms as skinny and weak. The settings are as follows:
- Hairy (for the ladies)
Battle for Bikini Bottom
A variant of the anchor arms is used to repair Robo-SpongeBob, after the real SpongeBob temporarily destroys him.
- It is a reference to part of an anchor called the "arm", which is the part that curves out from the bottom end of the main part and ends in the pointed part.