What can you do to reduce a chubby looking face?
I don't know how old you are but if you're young you'll grow out of it. my cousin did that. he was this super chubby gross kid. and then he turned 16 and omg... g o are g e o you s. he got all tall and everything evened out and now he's modeling for some agency. but if not all you can do is learn to style your hair right. if youget a bob it'll frame your face and help where as long hair makes it look worse.
You can't, you learn to live with it and learn how to style your hair to make your face appear thinner.
If you aren't over weight - then there is nothing you can do about it. If you are overweight - then losing weight in general will make you lose weight in your face also.
mandyloo is right,
Try doing total body work-outs, Running, jogging, Aerobics, ect.
you just gotta learn to love yourself.