Reply To: Retest or estimate? June 14, 2023 at 12:14 pm #126747 Josh GrayParticipant I may have been wrong on the 1%. First 30 min I averaged 150 Bpm and second have averaged 153 Bpm so a 2% drift. Again this felt like a really hard effort for me, I’ve only drifted into 150ish a few time the last 3 years