Physical fitness training is an important aspect of leading a healthy lifestyle. There are several synonyms that can be used to describe this type of training. The most common synonym is 'exercise', which refers to physical activity that is undertaken to improve health and fitness. Another synonym for physical fitness training is 'workout', which is a more specific term that refers to a structured exercise session. 'Fitness regimen' is another synonym that is appropriate for describing a set of exercises that are designed to improve overall fitness levels. Lastly, 'physical conditioning' is a synonym that refers to the process of gradually improving fitness levels through regular exercise and training.