Table 3. Examples of Activity Tracker Related Comments From Diaries.

Activity Tracker	Question	Representative Comments	Code	Classification
Fitbit One	Thoughts and experiences	“I really think the Fitbit should be waterproof! That way it could be used during water aerobics to measure movements and the heart rate.”	Negative	PU
Fitbit One	Difficulties	“Since I do cook (somewhat) at home, it takes a while to enter the new food and its calories, etc. into the new foods log…”	Negative	PEOU
Myfitnesspal.com	Difficulties	“Having a difficult time adding food and exercise without going out of the program and reentering information.”	Negative	PEOU
Fitbit One	New things learned	“I found that there are many questions that can be answered in the program “help” (how to) section.”	Positive	PEOU
Myfitnesspal.com	Thoughts and experiences	“I can see progress on choosing better types of food, also amounts. This has resulted in less snacking.”	Positive	PU