What is the answer to this riddle?

[Kt Coco]

I can flutter and take your breath away. I can take a beating but do not bruise. If I stopped you would be sure to lose. Everyday I am with you. What am I?

 

[-rachel stevens]

yep first thing i though was 'heart'

 

[T?R]

Eyelashes.
Or heart, although your heart will bruise.

 

[Susrut S]

<3 <3 <3 <3

it's a HEART.

 

[tin tin tinny]

Heart...and i actually worked that out myself...

 

[Joanne V]

Your heart. God that is easy if even I know the answer

 

[amber =] x]

i couldnt do it, i had to look at the anwers
i cheated