Neck and jawline shaper hands free

Sit up straight
Put your shoulders down
Put your hands on your knees
Open your chest,
Practice

Lift your chin slightly and pull the corners of your mouth to both sides in a strong grimace. Contract the lower jaw and this will pull your chest area up. As you exhale, make a “hie” sound. Do this, the sound 3 times and hold it. Then do 2 more sets of 10 times each.

Vocalizing the sound causes the neck muscles to contract more. You should feel the movement in your neck. This tightens the neck muscles and reduces / prevents a double chin while lifting the chest area.