Stadion's Sports and Martial Arts Training Discussion

I just recently rec'd your DVD and book on stretching. In your video and the beginning of the beginners exercises the narrator says that you need to be able to run a couple of miles and be able to do a couple hundred sit ups before beginning to do the exercises. Is this true? Am I able to start doin...

in the articles on this site it says to start by strengthening the core- the abdomen and back. but i also want to start strengthening my legs more in preparation for isometrics. basically then, if i'm doing my crunches, the sit-ups, and back extensions all with no extra weights, is it also okay to ...