If you're looking to pick up an activity tracker or fitness tracker, to make yourself a bit more active. You really can't go wrong with the Fitbit Charge HR. It's one of the best, if not the best fitness tracker available, especially at this price point. The Fitbit Charge HR is typically priced at around $149, however eBay has it for just $99.99 right now, effectively knocking a third off of the price. Right now, eBay has it available in black, blue, pink, teal and tangerine. Although many sizes are sold out, so you'll want to click on the link below and make sure your size is still in stock.
The Fitbit Charge HR will track all sorts of vitals for you. It'll obviously track your steps and activity. But it will also track your workouts automatically. So if you spend an hour running on the treadmill, it'll track that for you. Additionally, it'll track the elliptical and outdoor bike (unfortunately, the stationary bike doesn't get tracked automatically). The Charge HR will also track your sleep. So you can see how well you are or aren't sleeping at night. Which can be very useful. As the name notes, the Charge HR does have a built-in heart rate monitor which will track your heart rate all day. This is great for seeing what zones you are in during your workout.