My daughter and her friends are typical 7th graders. When they find a new activity they like, they dive in head first leaving all other activities behind in the splash. Doesn't matter if they also are involved with trumpet, violin, piano, biking, rock climbing, drama, cooking, ballet, fencing, or any other activity. Doesn't matter that they have homework and the need for some free time and family time. To this age group, a new activity is like falling in love - it becomes their be all, end all.