Too much walks, parks, runs and soccer and they get agitated, cranky and want me to hold them. That's when I know I've overdone it.
Home activities tend to be more soothing and mentally challenging, but it makes them want to speed up a little.
Just like with adults, you strive for a balance between running around, growing in all directions and finding a peace within, and there seems to always be too much in each plate to eat at once. And the time you break it into doesn't seem to be equivalent either: 15 min in the morning is longer than an hour in the evening.
At the end of the day, if I am not sure that my own scale is balanced, how do I know if I balanced theirs?