Are worries over a double chin bringing you down?
I wish more than anything that I could tell you there is a simple work out to tone up your chin but unfortunately fat is fat (no matter where it is). The only way to get rid of fat is with a total-body weight-loss program (eating healthy and working out), which can help you lose some fat in your neck and face.
More than fat, the bigger threats to a firm, youthful chin are gravity, sun exposure, smoking, genetics and the passage of time.
Trust me, if there were such a work out, I'd be spreading the info like wildfire but there's not. I hate to sound like a broken record, but the best way to have a toned chin for now is: Don't smoke, wear sunscreen and try to maintain a healthy weight.