I was playing basketball when all of the sudden my arms stiffened up and I couldn't do anything
Dreams about playing sports, like basketball, often symbolize competition, teamwork, and personal ambition. When you suddenly experience stiffened arms in the dream, it may reflect feelings of frustration or helplessness in your waking life. This could be related to a situation where you feel restricted or unable to act, whether it's in a personal relationship, work, or a project you care about.
The act of playing basketball can also signify a desire to achieve goals or to be part of a community, so the stiffness might suggest that you're facing obstacles that are preventing you from engaging fully with those aspirations. It might be worth considering areas in your life where you feel stuck or unable to express yourself. Reflecting on these feelings can help you identify potential barriers and find ways to address them.