I am currently undergoing an apprenticeship at a company and there has just been a change of trainer. At his farewell, the old trainer mentioned that he thinks it is important to have fun with what you do. This is the only way to ensure that you can stay physically and mentally fit until retirement, without problems such as burnout.
This question has given me food for thought…
Of course, it is important to have fun at work, because that would be really optimal.