This is a practical application of the Multi-Size Technique, which lets one expand their own body. The point of swelling a single part of the body is to use the weight to increase the power of one's physical attacks. Any body part may be augmented this way, but for ease of use the arms and legs tend to be chosen quite frequently. The speed of the expansion is exceedingly sudden, which makes it extremely difficult to avoid. Like the majority of the Akimichi clan's techniques, this one requires a considerable amount of chakra. Because of this one may choose to use one of the Three Coloured Pills.