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Motion4Motion is a training-free framework for cross-subject motion transfer presented at SIGGRAPH 2026. Unlike prior skeleton-based approaches that only work for human-like characters with predefined skeleton topologies, Motion4Motion steps out of the skeleton framework entirely. It models the motion flow of a subject in a video rather than its skeleton, enabling motion transfer across entirely different species (e.g., human-to-animal) at inference time without any task-specific training or fine-tuning.