Joy Upshaw is 65 and a champion track-and-field athlete. And one of her secrets to success is key to all of us as we age and try to stay our best: Some days you got it, and some days you don’t. “You got to be careful with our age,” she says about her daily training regimen. “I try to make every day an ‘A’ day, but it could be a ‘B.’ And if it is, I'm not going to worry about it.” Joy’s articulating something smart that can help anyone with their health and fitness goals, eve