In everyday life, physical effort is often minimized and convenience is prioritized, making it difficult for many people to sustain light exercise and stretching despite well-known long-term benefits. This challenge often arises not from objective movement limitations, but from whether an action feels doable in the moment and, therefore worth continuing. This position paper argues that subtle VR hand redirection (HR) can be reframed as a form of cross-sensory support for sustained practice by targeting perceived doability: a moment-to-moment cognitive appraisal that an action is within one's capability while requiring manageable effort. We propose that conservative HR, applied within known perceptual limits, can create repeated micro-success experiences (e.g., reaching a virtual goal earlier with similar physical movement). These micro-successes may increase continuation intention and early re-engagement without relying on overt pressure or intensive coaching. At the same time, such support raises questions about autonomy and authenticity. We therefore articulate two research questions: (RQ1) how HR shifts perceived doability to support sustained practice and positive behavior change; and (RQ2) when HR functions as acceptable support versus becoming counterproductive by undermining authenticity, agency, trust, or fostering dependence. We present an initial sit-and-reach VR prototype, outline a research plan, and identify key design tensions to spark community discussions on autonomy-preserving cross-sensory futures in HCI.

翻译：在日常生活中，体力消耗通常被最小化，便利性被优先考虑，这使得许多人尽管深知长期益处，却难以坚持轻度锻炼和拉伸。这一挑战往往并非源于客观的运动限制，而是取决于某一动作在当下是否感觉可行，从而值得继续。本文提出，将微妙的虚拟现实手部重定向（HR）重新定义为一种跨感官支持形式，通过针对“感知可行性”这一即时认知评估（即个体认为某一动作在自己能力范围内且需要可控努力），来促进持续练习。我们假设，在已知感知阈值内应用的保守性HR，可以创造重复的微成功体验（例如，通过相似的肢体动作提前到达虚拟目标）。这些微成功可能在不依赖公开压力或强化指导的情况下，增强持续练习的意愿和早期重新参与度。同时，这种支持也引发了对自主性与真实性的关切。因此，我们提出两个研究问题：（RQ1）HR如何改变感知可行性，以支持持续练习和积极行为改变；（RQ2）HR在何种情况下可作为可接受的支持，而非通过削弱真实性、主体性、信任或滋生依赖而适得其反。我们展示了一个初始的坐位体前屈VR原型，概述了研究计划，并明确了关键的设计张力，以引发学界关于人机交互中保护自主性的跨感官未来的讨论。