I personally LOVE my Fitbit Charge HR. It was a gift from my lovely boyfriend after I completed my dietetic internship.
What does the Fitbit Charge HR do? It continuously tracks my heart rate, provides all-day activity statistics, provides my workout statistics, and monitors my sleep! It also has caller ID, but I do not personally use this feature to help preserve batter life. It comes in a variety of colors and sizes. You can also link your Fitbit to My Fitness Pal!
What do I love it about it? I love my Fitbit because it keeps me from being lazy. With it monitoring my steps, I'm more self-conscious about how much I move throughout the day. I love monitoring my heart rate during exercise whether that is anaerobic or aerobic. I have figured out which exercises raise my heart rate more and also knowing roughly how many calories I burn during each session. The size is perfect with it not being too bulky. However if you do not like the look because it is more sporty, there are now Fitbit bracelet covers made my individual vendors on Etsy (click the link if interested). They are pretty cute but I like the sporty look.
The Fitbit comes in a variety of options such as the Zip, Blaze, Alta, Surge, Charge, HR, Flex, and One. Some are more advanced than others therefore being more expensive.
Would I recommend a Fitbit? YES, I would! Especially if you are trying to make a lifestyle change to start exercising more. Like previously stated, it keeps me from being lazy! Therefore, if you want to be more self-conscious about your activity level it is the perfect match!