Are u locks easy to break, and what are the best ways to enhance their security?

Yes, u-locks can be broken by determined thieves using specialized tools. To enhance their security, consider using a high-quality u-lock made of hardened steel, locking your bike to a secure and immovable object, and using additional security measures such as a secondary lock or cable. Regularly inspecting and maintaining your u-lock can also help prevent break-ins.