Cross Country Terminology 

XC -- Abbreviated form of Cross Country

CIF -- California Interscholastic Federation - governing body for high school sports in CA 

Invitational -- A large race hosted by one or more schools. They provide better competition and larger fields of competitors.

PR -- Personal Record - The fastest you have ever run for a given distance

PB -- Personal Best - Same as PR, but less commonly used 

Aerobic -- Running at an effort level that is in a heart-rate zone of 60-80% of your max.

Anaerobic -- Running at an effort level that is in a heart-rate zone of 80%+ of your max. Does not rely on the body's ability to process oxygen.

VO2 Max -- Refers to the maximum amount of oxygen that an individual can utilize during intense or maximal exercise

Threshold -- Refers to aerobic threshold training. Usually running for 15 to 30 minutes at a pace that is one minute slower per mile than your current mile PR.

Intervals -- Segmented running one at varying intensities. Intervals can be any distance, but are most commonly between 200m and 2 miles.

Recovery run -- 'Easy runs' that take place in the days between harder efforts. These allow you to recover between harder efforts. These are done at a conversational pace. 

Surge -- A strategic short burst of speed during a race. 

Splits -- The amount of time that it took to cover a certain distance in a race or workout. 

Negative Splits - A consecutive split for the same distance that is faster than the proceeding split. 

Positive Splits - A consecutive split for the same distance that is slower than the proceeding split. 

Kick -- Your final sprint at the end of a race. How strong it is varies by athlete and race conditions.   

Strides -- Moderately fast runs lasting between 50-200m. Usually done prior to a workout or race or after a recovery run.