Pre and Post workout stretches

Hey T men,every time i work out,i spend about half an hour stretching each muscle group after i have done a set. I have been looking for an effective stretch that would save me a lot of time, i am quite sure that doing the old hamstring stretch(sitting down with yours legs in front of you,trying to reach past your toes with your hands), is effective, streching just about all muscle groups (bar the abs) would i be right or does somebody know of a better stretch to use??

Look up Ian king’s article on stretching on Tmag. He shows some good positions for stretching the hamstrings.