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edX PH207x Health in Numbers 15 Online
OpenStudy (anonymous):

what is intensity A. How easily a person is able to do an activity B. How hard a person works to do an activity C. How hard a person plans to do an activity D. How difficult it is for a person to complete an activity

OpenStudy (petiteme):

Welcome to OpenStudy ^_^ Intensity is the amount of physical powerthat the body uses when performing an activity, so... B. How hard a person works to do an activity

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