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4 guides
Cardio
Tool What is your max heart rate? Slide your age and compare the formulas The famous "220 minus your age" is a rough average, not a measurement of your heart. Slide your age to compare three common maximum heart… 3 min Wearables
Explainer Can you trust the calories on your watch? See how far off it can be Your watch says you burned 412 calories, and it feels exact. It isn't. Wrist devices measure heart rate well, but calories burned is a… 4 min Wearables
Explainer Chest strap or wrist watch? How accurate is your heart rate? Your watch says 148, but is that really your heart rate? A wrist watch reads blood flow with green light; a chest strap reads the heart's… 5 min 3 picks Cardio
Explainer What is zone 2 cardio? Find your easy pace with the talk test Zone 2 is the easy end of cardio: an effort where you can still talk in full sentences. Most beginners go too hard on easy days and never… 3 min
Tool What is your max heart rate? Slide your age and compare the formulas The famous "220 minus your age" is a rough average, not a measurement of your heart. Slide your age to compare three common maximum heart… 3 min Wearables
Explainer Can you trust the calories on your watch? See how far off it can be Your watch says you burned 412 calories, and it feels exact. It isn't. Wrist devices measure heart rate well, but calories burned is a… 4 min Wearables
Explainer Chest strap or wrist watch? How accurate is your heart rate? Your watch says 148, but is that really your heart rate? A wrist watch reads blood flow with green light; a chest strap reads the heart's… 5 min 3 picks Cardio
Explainer What is zone 2 cardio? Find your easy pace with the talk test Zone 2 is the easy end of cardio: an effort where you can still talk in full sentences. Most beginners go too hard on easy days and never… 3 min