Your emotional state may affect your flexibility training.  If your mind is relaxed, your body will be more responsive to flexibility training.  What does it take for you to relax?  Don’t know?  Try listening to music and focusing on your breathing.  This is easy to do during your warm up.  Huh?  Yep, your warm up for your stretching session.  If you are going to stretch, do not forget to warm up your muscles before you begin.  Walking briskly for 10 to 15 minutes is a simple way to do this.  Then take 20 minutes to stretch you entire body.  It may be the best 30 minutes of your day.