Only one style for a start, the one that you will find a good instructor to teach it. What to look and how if you don't know? Take a friend with you that he/she studied martial arts before to check it as well.

Tip...See how are the students.

Every age is a good age to start.

try them out one by one

don't rely on strangers telling u what to do

sometimes even your friends are jealous

just make sure in the end

u take your vitamins train and say your prayers

and ull be fine

do the one you like best.. don't take to many at once you will only get confused.. being in shape doesn't mean much in martial arts.. being limber helps more then any thing ..

Learn to speak manner.

Lucky for me there are alot of classes i can choose from where i live. The following are krav maga, boxing, taekwondo, karate, Brazilian jijitsu, wrestling and an mma gym. Could i attend them all on a daily basis or do them one by one? also I am 18 and in excellent shape is this a good age for me to start martial arts?