My last dog, Chica, a beautiful yellow lab, needed a lot of exercise or she was a handful. I worried about her overheating, so for us, water was the answer.
The pond was only a few minutes from our house, but still, I had to drag her there. She knew lying is the shade was a good answer, but once I got her to the water she could retrieve floating objects forever.
If only I could have stopped her from stealing golf balls.