Davis recommends removing the physical activity monitor from your wrist while you sleep, as placing your hand close to your head could expose your brain to low-frequency waves. However, during the day, it's best to have the device on your wrist, rather than on your waist, to avoid exposing your internal organs to radiation. One of the biggest concerns of sleep trackers is that devices overestimate sleep, which can distort overall sleep data. There's not so much concern about the fact that it causes cancer, but rather because its activity tracking metrics aren't always accurate.
Knowing this, it's best to take the time to evaluate yourself, your fitness goals, your lifestyle, and your needs before investing in a fitness tracking device. Apple's watch models and fitness trackers are still relatively new, so there isn't much data on safety. These fitness trackers can be a great way to motivate yourself to achieve your health and fitness goals. While this is ideal for most people who can enjoy the benefits of tracking physical activity at an affordable price, it also means that fitness trackers aren't made for people with special conditions.
While fitness trackers have many advantages, they don't necessarily fit your needs or where you are on your fitness journey. For example, if you wear a fitness watch when you box, it's not recommended because it can affect the wrist support of the glove. For example, if your physical activity goal includes greater mobility, a fitness monitor won't be able to add any significant data. In addition, commercial fitness trackers may not be suitable for sports you regularly play, such as water sports, diving, or car racing.
Like Garmin and Fitbit, Apple's fitness trackers are among the most sought after fitness tracker models.