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. Sometimes fitness is also used as a reference to 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.
BIA Bioelectrical impedance analysis
BMI Body mass index
BMR Basal metabolic rate
BP Blood pressure
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.
PAL Physical activity level
RDA Recommended dietary allowance
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.
RER Respiratory exchange ratio
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.
RMR Resting metabolic rate
ROM Range of motion
RPE Rating of perceived exertion
VO2max: The maximal oxygen uptake measured in litres pr. minute.