Biofeedback short duration sensors for 24/7 wellness. Emphasis on heart rate, sleep and activity monitoring. The right fitness sensor will be based on your individual needs and how active your lifestyle is.
Some sensors will just be for step counting and reliable sleep and others with include GPS for running and advanced resting heart rate and Vo2 Max data. Vo2 indicates your aerobic fitness level, the more oxygen you can pass into your body the better. Basically the best metric to check your performance. All biofeedback sensors transmit data to your smart phone and include real time notifications.