A system for controlling physical activity for a person, including the steps of providing a task database having a plurality of task files which each have data relating to physical task requirements for a person and a plurality of frequency requirements which indicate a frequency for performing a physical task for the particular type of task of the task file, providing a personal data file for a person including data relating to allowable physical tasks and allowable frequency limits for the person when performing the physical task, comparing one personal data file having a selected persons allowable physical task and allowable frequency limits data with a task file having data relating to physical task requirements and frequency requirements of the task type of the task file and from the comparison outputting an indication of whether the selected person is able to safely perform one or more physical tasks in the task file.