weight or mass

f/5.6, 1/1,600, 200

I was at Stanford College and I saw a couple of my friends at the little skate park they have set up at the basketball courts. I had brought my camera to take photos of the large tower for weight and mass but I decided to use sport mode to catch them in action instead. Out of all this was the most clear and the subject jumped the highest which I thought looked the best.