I don't really trust websites that teach you how to defend because that's information that can't really be learned from a web site (been doing martial arts myself for a little under 10 years now I think).
The best thing to do, although might be more expensive, is to seek out self defence classes in your area or at least somewhere near by. Trust me you will learn a lot more there than ANY web site and provided you ensure the person teaching is qualified and insured, you will be getting hands on experience that you can only learn from that kind of an environment.
A small number of tips though that might help you:
-Don't let yourself get backed into a corner. Keep ways for you to be able to run away within easy reach because the best defence is to run away. ;]
-If you are taken off your feet guard your head. One fatal blow to the head could cause some serious if not fatal damage so that's the one area you'd need to protect. Curling up into the fetal position (into a ball) will protect your stomach and your chest as well as throat and face as well as groin area.
-When walking if you think someone approaching you might be suspicious cross over and walk on the other side of the road.
-In the US I believe you're able to legally carry pepper spray so that might be worth investing in (or a rape alarm if you're a female) but check your local laws becaue I think some states don't allow pepper spray to be carried for self defence. If you're in the UK pepper spray is illegal so I suggest an alternative which is a spray very similar to pepper spray only without the peppers. It's a chemical substance that will foam up extremely quickly leaving the attacker very confused and disorientated (sp) as well as leaving a dye marker on them for easy police capture.
That's really the best I can do as far as self defence goes I'm afraid. I don't want to be showing you how to fight off attackers and such because, as someone once said, "a little knoewlegde can be a dangerous thing." It's for this reason I think the best thing you can do is seek a professional class to attend for defnsive lessons.
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