You cannot really blame the kids because you maybe is the problem. Practice what you preach! After all you are the one responsible of what food to put in the table. Do not set food as rewards and put realistic goals. It is also better if you will spend time together exercising, in this way he will be more excited to do it because he is with you. Make them feel that you are together with this.

1. Treat childhood obesity
http://springhillgroupkorea.bravesites.com/entries/business/
springhill-group-medical-treat-childhood-obesity

2. Childhood obesity is usually caused by eating too much and
not getting enough exercise.
While there are some genetic and hormonal causes of
childhood obesity, studies show the primary cause of children
being overweight is due to lifestyle issues such as eating more
calories than is needed to support their growing bodies, daily
activities and metabolism.