What motivates me.

My weight has been an issue for me since high school. I've always known I should probably lose some weight and I have lost weight now and again but I've never been motivated to keep it off. Not even for my husband. But the other day I was watching my children playing together and I realized that before too long they are going to be playing tag and baseball and football and who knows what else and I won't be able to keep up. I'll be huffing and puffing along behind them pretending that I'm not mortified that I lumber like an elephant. I want to be able to play with them. I want them to know that I'm not going to have a heart attack playing tag with them! I just want me back. What happened to me?