Google has brought some serious competition to Whoop (and other screenless wearable trackers). Cherlynn Low for Engadget RATING : 8.8 / 10 Pros Lightweight, versatile hardware Fast charging Comprehensive and easy-to-use app Cons AI can be glitchy "You clearly didn't get the memo about taking it easy today." That was the headline to the summary of a workout I had logged in the new Google Health app. Minutes later, it was replaced with something less... aggro. "Adjusted your HIIT session details," it said, before going on to detail my workout and contextualize the metrics. Earlier that morning, I had been told by the AI Coach that my readiness score was a mere 48 (out of 100), after a long, stressful day prior resulted in my getting a lousy night's sleep. I finished my 54-minute HIIT class at 9AM, spending 41 minutes in vigorous cardio zones and reaching a peak heart rate of 169 bpm, so I could see why I was admonished.…