Bioinspired robots combine the best of both biology and engineering. Using tools learned from nature, we can build squid-like and other squishy robots to improve current capabilities in robotics, such as speed and energy efficiency. As one example, jellyfish and squids use the concept of resonance to swim more efficiently. Resonance is defined as a mechanical property, in which a system performs better when driven at or near its natural frequency. We will discuss the concept of resonance and how both animals, and now squid-like robots, use this concept to their advantage.