By a classified staff mom of  a daughter (8), a son (6) and a daughter (3):

My 8 and 6 year old are starting to participate in activities.  Activities as in: ballet, baseball, basketball, swimming lessons, piano lessons and the list goes on.  I do try and limit them to one activity per season/term.  Sometimes there is overlap that happens, particularly for my daughter who has been participating in ballet that goes all school year long.  I am always challenged with trying to keep myself sane in getting them to their activities, but also providing them with many opportunities. more...

http://blogs.oregonstate.edu/parents/2011/08/10/following-through/