I usually exercise in the morning it helps my mind from racing about other things I COULD be doing and every hour or so I stretch out when I am doing work or school work instead of eating and eating and eating... try only eating after doing a hard task (of course eating breakfast lunch and dinner DOESNT count just snacking) keep good posture and make sure to reward yourself every once in a while (right now I am trying to finish school but at the same time I wanna watch tv so I give myself a certain amount of assignments and if I don’t complete them then I don’t watch tv but if I do I can)