Just as in mathematics, recursion theory and formal logic paradoxa can be used to derive incompleteness theorems, physical paradoxa can be applied for a derivation of constraints on the dynamics of physical systems and of certain types of no-go theorems. For example, time paradoxa can be used against the outcome controllability of entangled subsystems. As a consequence, the requirement of consi...

BACKGROUND The ability to initiate and sustain health enhancing behaviour including physical activity requires appropriate self-perception of such activities. This study was conducted to investigate whether a group of Nigerian urban community dwellers are able to demonstrate a good perception of their physical activity behaviour. METHODOLOGY The study was a cross-sectional survey of 1,153 urb...