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Cheerleading that's pretty much it and Chrous
A person inexperienced or unskilled in a particular activity is Amature.
An activity trap is the risk of becoming so busy so as to miss the aim or purpose of a particular activity.
I've heard that she did cheerleading but it could be a false statement
15 countries participated in 1938. 16 were actually qualified, but Austria was unable to join because of the "Austrian Anschluss".
Intra activity refers to activities within businesses. Intra activity can also refer to activities within a particular department in businesses.
If "they" are a small, select group of people who participated in the Apollo program, then yes. Otherwise no.
The busiest time for any particular activity.