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 Prescription. Some key concepts of the physical activity prescription (frequency, intensity, duration) are important in implementing the guidelines. First, the prescription for aerobic physical activity in the guidelines is based on a total weekly volume of moderate- or vigorous-intensity physical activity.