Hardie plank siding is a premium brand of cement board siding (also known as fiber cement board siding) produced by the James Hardie Company.ardie plank can be purchased with a wood-grain look, a plain smooth look or a stucco type finish. Hardie plank also comes in simulated cedar shingle planks.
activity duration. Period (hours, days, weeks) required to complete an activity. Activities with zero duration are called milestones.
Physical activity is defined by its duration, intensity, and frequency ï® Duration is the amount of time spent participating in a physical activity session ï® Intensity is the rate of energy expenditure ï® Frequency is the number of physical activity sessions during a specific time period (e.g. one week).