Because martha leads a mostly sedentary lifestyle, the clinician should provide what type of guidance to her increase her activity levels?

Answer;
The guidance that would help increase her activity levels would be to walk short distances and slowly increase total activity time. 

Explanation;
A sedentary lifestyle involves excessive amount of daily sitting. Be it to watch television, work the computer, or even read, its negative influences include increased anxiety, cardiovascular disease, diabetes, depression, among others.