9 of the SEHS glossary’s terms, each with the part of the syllabus where you first meet it.
A measurement of the circumference of the abdomen, used as an index of abdominal (visceral) fat; values above about 102 cm in men and 88 cm in women indicate high health risk.
A structured period of activity before exercise, starting at low intensity and becoming progressively more intense and sport-specific, that prepares the body physiologically and psychologically for the activity.
The mass of water per unit volume, about 1,000 kg per cubic metre for fresh water and about 1,025 for seawater; it rises with salinity, increasing buoyancy.
Drag caused by the formation of waves when a body moves along or near the surface of water; it rises steeply with speed and is avoided by swimming underwater.
The force of gravity acting on a body’s mass, , acting vertically downward from the centre of mass; measured in newtons (N).
An index of environmental heat stress combining the natural wet-bulb temperature (humidity and air movement), black globe temperature (radiation) and dry-bulb air temperature, weighted 0.7, 0.2 and 0.1 outdoors.
Practising a skill in its entirety without breaking it into parts, suited to simple or highly organised skills whose subroutines are hard to separate.
The principle that bone adapts to the loads placed on it: bone loaded more than usual becomes denser and stronger, and unloaded bone loses mass and strength.
The product of a force and the distance its point of application moves in the direction of the force, ; measured in joules (J).