Replying to @Angelica | Health + Fitness zone 2 cardio is a great tool *BUT* it’s not the only tool 👇👇⁣ ⁣ Heart rate is affected by sleep, stress, menstrual cycle / changes in hormones, caffeine, and temperature. 👀⁣ ⁣ Problem is -⁣ ⁣ It’s difficult to determine how much these factors are affecting heart rate on any given day. ⁣ ⁣ This is why I use heart rate alongside rate of perceived exertion (RPE) and tools like the talk test to gauge intensity with running. 🫶⁣ ⁣ #runner #running #runningtips #zone2cardio #zone2running #cardioworkout #cardio #fitness #fitnesstips #runninggirl #runnergirl #beginnerrunner #halfmarathontraining