.@WHOOP is so bad at sampling heart rate during a run. 55 min in zone 5 is total joke. My Apple Watch had no issue getting the data (zone 2 run). I tried tightening it, different location. It always think my runs are done in zone 5. Same for my wife. Surprisingly, WHOOP gets the right data for all other workouts: biking, rowing, lifting, and even skiing (erg) 🤷