Doing this is all day is going to get tiring for your neck period. As you can see every little bit of your head being out in front of your shoulders causes stress to your neck and can make you tired and have pain. Doing this for long enough will leave you with text neck. Text neck can leave you with a number of postural disturbances and if not taken care of, some osteoarthritis, cervical issues, headaches, vertigo.. The list can go on. If interested, pick up Trigger Point Therapy for Headaches and Migraines:Your Self-Workbook for Pain Relief by Valerie DeLaune L.Ac.
Double chin exercise
Remember these exercises are like burn cream, if you put the burn cream on your burn and you burn yourself again, it will not fix the problem.