Summer

To me this sums up what growing up should be like.  When we said we'd take the boys out in the field they were gone, just running and running (uphill - you can tell they are aged between 2 and 4).  Then we played with a trailer, rolled down the hill and tried cartwheels (those of us with skirts or 5 months pregnant regretfully watched).  It was the nearest you can get to being 4 years old again as adults.