SFQ does seem to be primarily a medical and spritual qigong - and Master Lin practices (daily as I understand it from his talk to us at the retreat) - a very rigorous form of Tai Chi which is martial and his particular form has some Kung Fu type moves in it - usually as a warm-up before he does his SFQ practice.
Having said that I also understand that SFQ strengthens the internal organs which in turn strengthens the body core so while it's not necessarily a very physical form of qigong - it does benefit the body and it's not totally necessary for a person to undertake a more physical form unless they want to.
Everyone to their own I say and I would just suggest that you follow Master Lin's advice and leave 20 minutes between the different forms you participate in.
