Sam chien is the beginning and the end, constant training of sam chien will have long term health benefits and improve internal strength or "qi". SAm chien is another qi kung exercise at its extremist form.
Other chien forms are: tien te lin chien, tien kwan chien and sam chien sip di. Sam chien sip di is the most versatile chien forms. It is almost the combination of di sip kun and sam chien.