What are the human body's weak spots?

Message from Hugh Australia

if you mean physical weak spots for fighting
well a sharp toe bash to the inside of someones knees really make them feel like jelly
any punch your kick you can land to the chest slows someone down. note never go for head I'm not that built up but you learn not to think in a fight so no matter how dizzy they feel they will own you. if you jut them in the neck they'll be on there knees and if you strike them in the jaw upward there head will fly back which means they cant see you...You should run away now...however if you wish to continue. Tearing at the ligaments on the back of the knee heal or armpit really mame people. If you lack the strength to do this using your hands the you have K9 teeth for a reason...I'm not talking about little nips i mean latch hold using your molers then dig in the K9's and rip. Oh and also if there down don't hurt them that's just not fair. never use a hard object to hit someone on the head with or you will be bending over for Martyn Byant in the slam. If they kick you while your down them he broke the rules first if you can try for his inner knees if not... well use the squirrel tackle (grab squeeze twist in any order you like) remember never grapple a big person cause they are gonna win instead kick and punch (never use a headlock if you look at it i leaves you completely exposed.) if you get in as many fight as i have been in you realize something. The first punch comes from the right into the cheekbone they will the try to punch you with there left in the jaw this will be a hook shot then they will attempt to kick you in the nuts so when you sense things are getting nasty bend your elbows at 90 degrees and get ready to left your left leg cause he'll kick from the right. the rest is just expiriance... never start a fight try to avoid a fight but always help your friends. Remember only the first shot to the head hurts...try to slow everything down in your mind...and if you end up in hospital get your friends to learn the guys name.