We grew up around lots of safe, wide open spaces so played/ran outside most every minute we possibly could. Seems with dd that I must 'take' her somewhere to be active - the park, football sessions, swimming, etc. Even if I take her somewhere every day, an hour or so of physical exertion is far less moving about than the spontaneous everyday extended level of physical activity we had as children.
We all hear the reports of how children are more sedentary, with potential health problems as obesity increases. How much exercise do your kids get, and how do you ensure they get enough to be strong/healthy?