The law says a person must be able to complete an activity as often as the individual activity requires ie do it repeatedly.
Here's an example of a person being unable to do something repeatedly. "A person may be able to get themselves off the toilet using a grab rail, but it would be so painful and tiring that they would not be able to do it repeatedly (as often as required) throughout the day.
Hope that helps.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems