Manage to teach your kids the importance of self-respect and give them a healthy sense of competitiveness, especially against who they could be.
You will never have to worry about them struggling to adopt the healthy lifestyle because that is the obvious low-hanging fruit. The average person spends their whole life talking about what they are going to do without even following through.
If you are making steady progress with your goals and life keeps getting better as you are getting older. Stop worrying that much. You are already way ahead of the curve.