Getting your flexibility level up is not too hard. Just sit on the floor, straddle your legs, put a book on the ground (or watch TV) and stretch forward. There are a lot of ways to stretch incorrectly, so make sure you look for that kind of stuff online before you do anything too extreme. It shouldn't hurt too badly, so don't just deal with a lot of pain trying to stretch further. In any position, stretch further and further UNTIL it hurts. There should be a minor discomfort as your muscles are being worked a little bit beyond their normal level, but it shouldn't HURT badly... if it does, you went too far and you need to pull back a little. Develop a routine and stick to it daily for about a month, then evaluate your progress. If you show improvement, stick to the routine and maybe step it up a notch or two. If not, take a look at what isn't working and come back and ask about it again.