Oura Adds Personalized Cardio Effort Scores for Gen3 Rings and Up

Oura is rolling out Cardio Effort to Ring Gen3 and later models. It measures heart and lung strain for each workout and as a weekly total, compared to your personal baseline. It factors workout length and intensity by comparing active heart rate to long-term resting rate. Weekly totals are rated Light, Fair, Maintaining, Building, or Reaching.