Working Out is a Real B*tch

5/26/2009 2:40 PM PDT BY TMZ STAFF
If you haven't gone to the gym lately, this dog named Kirin is about to make you feel even worse about it -- she does squats ... on two legs ... three to four times a week!

Kirin: Click to watch
Squats -- so easy a Japanese Border Collie can do 'em. What's your excuse?