Have you ever reached a physical plateau? The last time I did, I tried strength training. I remember looking through the window at Circuit Works in Santa Monica and debating if I wanted to join. I watched about fifteen people dart around a room alternating between running on treadmills, and lifting weights on various machines. Between gasps of air, they did jumping jacks and held planks in the center of the room. I heard music pumping through the walls, and admired the mix of men and women sweating, seemingly enjoying themselves in comradeship.