HDL (High-density lipoprotein) - Considered "good cholesterol" because it scavenges "bad cholesterol" from the rest of the body and stores it in the liver.

Jorgensen, Henrik (1961-) - One of the greatest Danish distance runners ever. Raised in a running family Henrik had his breakthrough as a 17-year old, when he ran a 10000m on 29.36,6. The year after, in 1980, he set a national record when he ran 29.00,3. Won the 1988 London Marathon (2:10.20). Finished 19th in the 1984 Los Angeles Olympic Marathon, and 22nd in the 1988 Olympic marathon. He also set a national record on the 5000m (13.27,76).

Juice - A slang term referring to anabolic steroids.

Lebow, Fred - New York Road Runner's President who died in 1994, Lebow promoted big-time mega-marathoning at the helm of the "New York City Marathon".

Lenihan, John - Winner of 1991 World Mountain Running Championship in Zermatt, Switzerland. 9 times winner of the race up Carrauntoohil (Ireland's highest) and multi Irish Champion. Although a mountain running specialist - winner of the 1989 Snowdon International - he also won the Irish Half Marathon championship twice and featured on the Irish Cross Country team.

Lipolytic - The chemical breakdown of fat.

Sleeve - The hollow metal tube that fits over the bar on most exercise barbell and dumbbell sets. This sleeve makes it easier for the bar to rotate in your hands as you perform an exercise.