Cross fitness training involves combining different exercise routines to provide variety and target all muscle groups. Experts consider it a more holistic approach to fitness that can achieve results in a shorter time. Some benefits include conditioning the entire body, preventing boredom through varied routines, flexibility to adapt to schedules, reduced risk of injury from focusing on one activity, and ability to continue exercising even if injured in one area. The overall goal is to find an approach that keeps exercise enjoyable while achieving health and fitness objectives.