The Fitbit Sense smartwatch is a newly refreshed addition to the rapidly growing array of smart wristwear on the contemporary market. It’s a unique entry, however, in that it can keep a record of its wearer’s workouts and physiological responses to exercise, in effect establishing and maintaining one’s personal fitness profile.

The Sense watch family includes the Inspire 2, the Versa 3 and the Sense. The Inspire 2 is the most economical option; it’s waterproof, and boasts a score of exercise modes, as well as sleep and heart rate tracking functions, calendar alerts, and reminders, and it includes Fitbit’s Active Zone Minutes feature.

The Versa 3 adds GPS to the mix, and it can track the intensity of your exercise regimen so you know when you’re most demanding of your body. It also brings in Google Assistant, Amazon Alexa, can play music via Pandora and other services, and can take care of your Fitbit payment schedule.

The top-of-the-line Sense is indeed sensitive—it can read your sweat to determine your level of stress, and boasts an onboard ECG and constant heart rate monitor/tracker as part of its ‘Premium Health Metrics’ dash. It also works in most of the feature set of the Versa 3, making it the ideal companion for your workout.