Jumping is a great exercise for overall fitness, but it does not directly slim your face.
While jumping can help you lose weight, and weight loss can make your face appear slimmer, it does not specifically target facial muscles. To achieve a slimmer face, you would need to focus on exercises that target those specific muscles.
Facial exercises, like cheek lifts and jawline exercises, can help tone and strengthen the muscles in your face, making it appear more defined.
Additionally, maintaining a healthy diet, staying hydrated, and getting enough sleep can also contribute to a more sculpted facial appearance.