What is a casual hobby that would be fun to get into?

There are many great answers, and what is most fun for you depends on what your interests are. For instance, if you enjoy running and spending time with others, a good hobby that combines these interests could be ultimate frisbee. Ultimate frisbee involves a lot of running as well as teamwork and strategy to score points during games! It can also be played casually with friends without needing much experience beforehand.