Inside Yuba City CrossFit's 4,800-square-foot fitness facility, a dedicated team of coaches stands arms akimbo before a stockpile of barbells, platforms, and gymnastics rings. Though such a scene may seem intimidating, the staff enthusiastically welcomes senior citizens, children, and adults of all fitness levels, provided all are prepared to work hard. Each day, they lead a workout regimen that employs basic human movements?think pushing, pulling, squatting, lifting, and jumping?to breed a high degree of general fitness. And their Workouts of the Day (WOD) are never the same. For example, they might include gymnastics exercises and power lifting one day, and rowing and push-ups the next, preventing muscles from getting bored and throwing temper tantrums in front of everyone.