Fitbit Charge 5 + Premium connects the dots between your activity. sleep and stress so you can make the best decisions for your body. mind and health. It all starts with your 6-month Premium membership and Daily Readiness. a score based on activity. sleep and heart rate variability (HRV) that helps you optimize your workout routine. Your score comes with personalized activity recommendations: low means go easy and recoverlight yoga. deep breathingwhile a high score gives you the green light to go all out. Enhance your recovery routine with advanced stress-management tools like the on-wrist EDA sensor. Stay ahead of heart health with atrial fibrillation (AFib) heart rhythm assessments using the on-wrist ECG app. And youll always have motivation to reach new goals with hundreds of guided workouts. a gallery of refreshing mindfulness sessions plus the fitness features you know and love like Active Zone Minutes and built-in GPS.