New devices include Fitbit Versa Lite Edition smartwatch, and a trio of activity trackers - Fitbit Inspire HR, Fitbit Inspire and child-friendly Fitbit Ace 2.
Included in the deal are an upgraded on-device dashboard and goal-based exercise modes; also there are new apps and clock faces.
When it comes to the fourth quarter, Fitbit expects revenues to be greater than $560 million, with device sales down and a higher average selling price.
Fitbit Care combines wearables, digital interventions and health coaching through the Fitbit Plus app to deliver a more personalized healthcare experience.
With Twine Health, Fitbit gets a clinically proven health coaching platform to drive better health outcomes and lower healthcare costs.
The company's first smartwatch is getting better with the day, with a bunch of new health-related apps being announced.
The companies are targeting availability as soon as possible in 2018 and will continue to explore opportunities to help people better manage their diabetes.
The company has also announced a new smart scale (Aria 2), sweat-proof Bluetooth headphones (Flyer), and new premium guidance and coaching offering.
It will be water-proof up to 50m, have a multi-day battery life, and deliver the best health and fitness experience.
The eight-week-long study was looking to investigate whether fitness wearables could encourage young teenagers to take more exercise.