In alphabetical order ...

Aerobic: energy metabolism of substrates with consumption of oxygen.

Anaerobic: energy metabolism of substrates without consumption of oxygen.

Fitness: Can be used as a general expression for the overall physical condition of the body. On this site, the term is more specifically understood as the maximal oxygen uptake in millilitres pr. minute related to the bodyweight in kilograms (ml/kg/min). This is also called relative VO₂max.

Heart rate reserve: Describes the interval between resting heart rate and maximal heart rate. This interval is often used as the basis for calculating exercise intensity. Resting heart rate being 0 % intensity and maximal heart rate being 100 % intensity.

Lean body mass: Total body weight minus the weight of all the fat in the body. Can be calculated as: total bodyweight x (100% - fat%).

Maximal heart rate: Indicates the individual maximal attainable heart rate. Maximal heart rate drops with age and an educated guess can be based on the formula 220 - age. There is however a large individual variation and 5 % of a population will deviate more than 20 beats per minute from this estimate. 

METS: One MET represents an energy expenditure equivalent to resting energy expenditure. The standard value for 1 MET is 3.5 ml O2 pr. kg body weight. 

RM: Repetition maximum. The heaviest weight that can be lifted a specified number of times. 1 RM is the heaviest weight that can be lifted one time in good form. 6 RM is the heaviest weight that can be lifted 6 times.

Relative VO₂max:  The maximal oxygen uptake in millilitres pr. minute related to the bodyweight in kilograms (ml/kg/min). On this site this is also referred to as fitness.

VO₂max: The maximal oxygen uptake measured in litres pr. minute.

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