Acting at high speed enables creatures to survive in their harsh natural environments. They developed strategies for fast actuation that inspire technological embodiments like soft robots. Here, we demonstrate a series of simulation-guided lightweight, durable, untethered, small-scale soft-bodied robots that perform large-degree deformations at high frequencies up to 100 Hz, are driven at very low magnetic fields down to 0.5 mT and exhibit a specific energy density of 10.8 kJ m⁻³ mT⁻¹. Unforeseen asynchronous strongly nonlinear cross-clapping behavior of our robots is observed in experiments and analyzed by simulation, breaking ground for future designs of soft-bodied robots. Our robots walk, swim, levitate, transport cargo, squeeze into a vessel smaller than their dimensions and can momentarily close around a living fly. Such ultrafast soft robots can rapidly adapt to varying environmental conditions, inspire biomedical applications in confined environments, and serve as model systems to develop complex movements inspired by nature.

高速行动使生物能够在恶劣的自然环境中生存。他们开发了用于快速致动的策略，从而激发了诸如软机器人之类的技术实施方案。在这里，我们演示了一系列由仿真指导的轻巧，耐用，不受限制的小型软体机器人，这些机器人可以在高达100 Hz的高频下执行大规模变形，并在低至0.5 mT的极低磁场下被驱动并展示出比能量密度为10.8 kJ m ^-3 mT ^-1。我们的机器人在实验中观察到了无法预料的异步强非线性交叉拍击行为，并通过仿真进行了分析，这为软机器人的未来设计开辟了道路。我们的机器人行走，游泳，悬浮，运输货物，挤入小于其尺寸的船只，并可以暂时围绕一只活着的苍蝇而关闭。这种超快的软机器人可以快速适应各种环境条件，在有限的环境中激发生物医学应用，并可以作为模型系统来开发受自然启发的复杂动作。