Lean Body Weight:
Your body weight minus the percentage of body weight that is stored fat.

Low Impact Aerobics
Low impact aerobics are routines where one foot is always in contact with the floor. High-impact routines involve more vigorous movements including skips, hops, and jumps where both feet may be off the floor at the same time.

Lactic Acid A substance caused by anaerobic training of the muscles, a build up prevents continuation of exercise, and a good example is 400 metre runners. Watch how they slow down during the last 100 metres of the race.

Lat's Abbreviation for Latissimus dorsi, the large muscles of the back that move the arms downward, backward and in internal rotation.

Lean Body Mass Everything in the body except for fat, including bone, organs, skin, nails and all body tissue including muscle. Approximately 50-60% of lean body mass is water.

Lifestyle Individual patterns of your typical life.

Lift Off Assistance in getting weight to proper starting position.

Ligament Strong, fibrous band of connecting tissue connecting two or more bones or cartilage or supporting a muscle, fascia or organ.

Lipids All fats and fatty acids.

Lipoprotein Fat carrying protein in the blood.

Lock Out Partial repetition of an exercise by pushing the weight through only last few inches of movement.

Low Density Lipoprotein (LDL) A core of cholesterol surrounded by protein, often referred to as bad cholesterol.

Lower Abs Abbreviation for abdominal muscles below the navel.

Lumbar Lower region of you spine, vertebrates L1 to L5. Used for bending and extending the body forward and back, with the aid of the abdominal and erector spinae muscles.