I do it and really enjoy it.
I am the least sporty of types, completely non-competitive athletically and it suits me very well.
It is gentle exercise that promotes health, helps with balance and has certainly improved my stamina.
There is absolutely no question of 'feeling the burn' or losing either inches or weight when you do it, though.
It also does help a lot with stress as you are having to concentrate so hard on remembering the next move and how to do it correctly that you cannot think of anything else.
Have a look here:
http://www.taoist.org.uk/
Good Luck !