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Table 1 Theoretical and operational definitions of skill-related physical fitness (adapted from [14])

From: Feasibility and content validity of the PERF-FIT test battery to assess movement skills, agility and power among children in low-resource settings

Domain Theoretical definitions Operational definitions
Agility The ability to rapidly change the position of the entire body in space, with speed and accuracy. The child is asked to jump side to side at high speed and with great efficiency.
Balance The maintenance of equilibrium while stationary or in motion. The child is asked to stand on one leg while holding on to his free foot for an extended period of time (static).
The child is asked to grasp his/her unsupported foot while making slow steps in the agility ladder (dynamic)
The child is asked to move his arms and trunk forward to pick up an empty can while standing on one leg.
Coordination The ability to use the senses, such as sight and hearing, together with moving body parts, in performing motor tasks smoothly and accurately. The child is asked to time arm and leg movements to perform a catch or make consecutive jumps smoothly.
Power The rate at which a person can perform work (strength over time). The child is asked to apply great force to a heavy object to make a throw or propel the whole body forwards to make a long jump.
Speed The ability to perform a movement within a short period of time. Running speed is tested in the agility ladder where the child is moving forward from the start line quickly to the end of the ladder, turn and run back.
Reaction time The time elapsed between a stimulus and the beginning of the reaction to it. Most items have a start signal to which the child has to respond; many adaptation made to make a movements successful are based on rapidly responding to a stimulus and adapt the movement to that stimulus to avoid stepping on a bar (agility items) or estimate the trajectory of a bouncing or thrown ball.