I volunteered at the Broward County Jail Boot Camp and taught Qigong-based stress management. The class was for young, first-time offenders who had the choice of completing a very tough boot camp or going to jail. They were under a lot of stress from the situation, as well as from their peers and the officers running the camp. None of them had even heard of Qigong techniques, but I was able to get several of them so relaxed that they actually fell asleep standing up!