Our daughter just turned 11.. but she is 5' 4" and around 100lbs.
She plays competative basketball..hard... three to four times a week all year round. Back in november she nearly broke her foot. Six weeks in a boot, no physical activity and I though aliens HAD taken her, or wished they would.
The hormones, we went through two cycles while she was healing.. we, I say we cause the whole damned family was cursed with her. We all walked on egg shells, tried to not look at her 'funny' and did whatever we could to to keep the head spining monster away.
She is healed, back at the gym busting a sweat four days a week, and our sweet loving, kind, funny, FUN TO BE AROUND daughter is back. She is goofy, helpful, patient, kind, loving, generous, a totally different kid than that hellion that showed up about five days into her recovery and lack of physical activities.
I guess what I am saying.. and I know our daughter is younger than the magic 12.. but she looks 14


.. She needs the physical release of exercise in order to stay uncrazed by the raging hormones. Maybe it would work for your kiddos too.