Joy is first of the four core values — the others being mindfulness, compassion and competition — that Warriors head coach Steve Kerr has used to guide the Warriors. His philosophy is simple: To play your best, you first must have fun. But the longer Golden State tries to stay atop the NBA, the trickier it becomes to maintain a jubilant approach. The grind of playing into June each year takes a toll, mentally and physically. In Monday night's 123-103 rout of the Suns at Oracle Arena, the Warriors played an uninhibited, joyful brand of basketball for perhaps the first time this season.