I'm not all that familiar with chi running so can't really answer that part of your question. Does your book have a suggested program of building up your run/walks? I am using this 'couch to 5 k' program to get back into running after about 15 months off (I ran a half marathon in Feb 07 but then hadn't been for a run until last weekend). My fitness level starting this was a bit of cycling and walking (I don't have a car so walk and cycle everywhere) but not much of a conscious exercise program for a year or so
http://www.coolrunning.com/engine/2/2_3/181.shtml
I'm using these podcasts for the interval prompts
http://www.ullreys.com/robert/Podcas...ategory-7.html