Is it possible to practise Qigong exercises from different systems at the same time?

Every Qigong-system has its own inner logic and method. By practising different systems at the same time the flow of energy may be stimulated differently and possibly be influenced in an opposing way. It is therefore very important not to collect and practice exercises from different systems arbitrary at the same time. It is best to practise only one suitable Qigong-system supervised by a Qigong-Master or an authorised teacher.