Quote Originally Posted by hotaru_oz
I have a really bad attention span so things like Tai Chi I could never grasp.
There's research that indicates that physical activities can assist with improving attention span, particularly activities which develop left-right coordination which Tai Chi would do (amongst other sports). Some people us it as a way of assisting kids with ADD and ADHD.

Some articles:
Exercise and ADHD Symptoms
ADD and Exercise
Exercise for People with a Short Attention Span
ADHD, Exercise and Michael Phelps

Btw I'm not for a moment suggesting that you have ADD or ADHD, many people have attention problems even w/o ADD/ADHD.