Kung Fu isn't one martial art, Kung Fu is a collection of Chinese fighting sports/systems and consist of 100's of styles. T'ai Chi is a Kung Fu style too.

There are two major streams: soft kung fu like T'ai Chi (the idea is an iron bar wrapped in cotton) and hard kung fu (just an iron bar ). Prepare yourself for a lot of serious pain when practising some hard styles.

Many kung fu styles are based on animals: tiger, monkey, crane, snake, mantis. There's a best kung fu style for you, as there are so many. Look around what best suits your character, physics etc, as it takes a while to master any style.