I started very light (like empty bar lol) and wasnt feeling much so I did do some chins at the end of sessions at the start. But like has already been said, get stuck into the program how its written and get a feel for things. When you are nearly maxing out on every lift, you are likely to be ruined and will find it very difficult to do them. I soon experienced this and dropped the chins when things got heavy, just couldnt do enough of them to get any real gains because I was already taxed