Billy MillsMills, Billy - Born on an Sioux Indian reservation in South Dakota, Mills's Olympic story is the stuff legends are made of. He won the 1964 Tokyo Olympic 10000m with a 46-second PR and a heroic homestretch gallop. Mills also set a 6-mile world record in 1965.

Body composition - The percentage of your body weight composed of fat compared to fat-free mass.

Bulking Up - Gaining body weight by adding muscle, body fat or both.

Cerutty, Percy - The late Australian coach of Herb Elliott, Albie Thomas and other great runners from Down Under in the 1950s and 1960s. Regarded by many as an eccentric, Cerutty was infamous for his "killer" hill sessions in the steep sand dunes of his training camp at Portsea.

Crash Diets - fad type diets intended to reduce weight very quickly; in fact they reduce water, not fat tissue

Hearn, Lacey - American runner that captured a bronze medal on the 1500m at the 1904 Olympics.

Hyperglycemia - excessive amounts of sugar in the blood

Ligament - Strong, fibrous band of connecting tissue connecting 2 or more bones or cartilages or supporting a muscle, fascia or organ.

Muscle Head - Slang for someone whose life is dominated by training.

Nutrients - chemical substance found in food that is necessary for good health

Shrubb, Alf - Winner of 20 British distance titles between 1900 and 1904. Shrubb was one of the first to record his training methods in book form.

Traps - Abbreviation for trapezius muscles, the largest muscles of the back and neck that draw head backward and rotate scapula.