I Can Be Small As A Mouse Or As Big As A Whale, But No Matter How Big

Riddle: I can be small as a mouse or as big as a whale, But no matter how big, I'm no burden to scales. You can fight me for practice, but you'll never win. I follow bright people, but I'm always dim. If you're needing a partner, I'm as keen to dance. But I know no move that doesn't copy your stance. What am I?

Answer: A shadow.

Source: https://www.riddles.com/10633

I can be small as a mouse or as big as a whale, But no matter how big, I'm no burden to scales. You can fight me for practice, but you'll never win. I follow bright people, but I'm always dim. If you're needing a partner, I'm as keen to dance. But I know no move that doesn't copy your stance. What am I? — I can be small as a mouse or as big as a whale, But no matter how big by Alystr Zelland v1.

Riddle: I can be small as a mouse or as big as a whale, But no matter how big, I'm no burden to scales. You can fight me for practice, but you'll never win. I follow bright people, but I'm always dim. If you're needing a partner, I'm as keen to dance. But I know no move that doesn't copy your stance. What am I? Answer: A shadow. — by Alystr Zelland v2.