Sarah Olsen

Sarah spent her twenties competing in endurance running and learned recovery science the hard way — through a sequence of overtraining episodes that taught her to take HRV, resting heart rate, and sleep quality seriously well before consumer wearables made the data accessible. She's been writing about recovery, sleep, and the train-or-rest decision for nine years, drawing equally on the published literature and on what actually works for the readers who write in with their data.

At Dorsi she reviews articles on heart rate variability, sleep tracking accuracy, recovery scoring, and the daily go/no-go decision every serious trainee eventually has to make. Her review priority is keeping the practical guidance honest about how noisy these signals are at the individual level, while still extracting the rules that hold up across most readers.

Sarah no longer races but still runs five times a week, lifts twice, and has been wearing a chest strap to bed since 2017.