So much harder with kids, especially when they are in school, and you work all day. So I give credit to the many of who have kids, and stay in shape. Basically, it does take discipline (of which I have none), dedication and eating correctly. But staying on the same course is really hard. Kids get sick, get up at night, not feel good, changes your sleep habits. Same with the morning.
BUT, I can't imagine my life without my kids and family. Bottom line, they are the most important thing in life.