Strength training carries inherent safety risks when exercises are performed without supervision. While haptics research has advanced, there remains a gap in how to integrate on-body feedback into intelligent wearables. Developing such a design space requires experiencing feedback in context, yet obtaining functional systems is costly. By addressing these challenges, we introduce FlexGuard, a design space for on-body feedback that scaffolds safety during strength training. The design space was derived from nine co-design workshops, where novice trainees and expert trainers DIY'd low-fidelity on-body feedback systems, tried them immediately, and surfaced needs and challenges encountered in real exercising contexts. We then evaluated the design space through speed dating, using storyboards to cover the design dimensions. We followed up with workshops to further validate selected dimensions in practice through a proof-of-concept wearable system prototype, examining how on-body feedback scaffolds safety during exercise. Our findings extend the design space for sports and fitness wearables in the context of strength training.

翻译：力量训练在无监督情况下进行时存在固有的安全风险。尽管触觉研究已取得进展，但如何将体表反馈集成到智能可穿戴设备中仍存在空白。开发此类设计空间需要在具体情境中体验反馈，然而获取功能系统的成本高昂。通过应对这些挑战，我们提出了FlexGuard，一个用于在力量训练期间提供安全支架的体表反馈设计空间。该设计空间源于九次协同设计研讨会，期间新手训练者与专业教练共同制作了低保真度的体表反馈系统，即时试用，并在真实训练情境中揭示了所遇到的需求与挑战。随后我们通过快速约会法评估该设计空间，使用故事板覆盖各设计维度。我们通过后续研讨会，借助概念验证可穿戴系统原型进一步在实践中验证选定维度，探究体表反馈如何在训练期间构建安全支架。我们的研究发现拓展了力量训练情境下运动与健身可穿戴设备的设计空间。