Get a total containment rest, there is nothing complicated about it. More than likely your 11 yr. old will not have perfect form, so a Whisker Bis. would not be a good idea. You'll see a lot of inconsistency with shots with a WB. Once you you release your arrow with a total containment rest, there is nothing that is going to affect your shot. You can get away with a lot more with a total containment than you can with the Whisker Bis., which is ideal for an 11 yr. old.