Vincent Soberano doesn't look fifty. He has the powerful physique of a much younger man. How he maintains this level of fitness at an age when many people's health declines is the subject of 50.

Soberano attributes his healthy body to his "ageless" Martial Fit Life system, which breaks down into three areas: exercise, nutrition, and relationships. He recommends martial arts training as a primary form of exercise, as training improves strength, aerobic capacity, and endurance.

Nutrition is an important aspect of any anti-aging program. Eating right improves overall...