Ultrahuman Ring Air Review: A Subscription-Free Smart Ring

The Ring Air makes suggestions based on your circadian rhythm and the time of day. Get sunlight in the morning, delay stimulants until adenosine has cleared, and remember to stop drinking coffee toward the end of the day. It also uses heart rate drop as an indicator of recovery (if your heart rate drops earlier in the night, you recover better) and suggests reasons why it may not have fallen as quickly, such as meals too close to bedtime or alcohol. This is all commonsense stuff, and there’s a fair bit of unnecessary jargon when simpler language would suffice, but it helps to