Mechanosignalling is an essential function in healthy hearts, and it may be impaired in cardiac conditions, such as heart failure, where the heart becomes less able to pump the blood needed by the body. Heart failure is a significant and growing problem. It affects millions of people globally including over 920,000 people in the UK, and costs over $100bn worldwide. Understanding the details of how mechanosignalling works in the heart, and what happens when it malfunctions in heart failure and other heart conditions, is important. It can help improve how to manage these conditions and open up new areas to explore for possible treatments.