I have always wondered what is safe... sometimes my heart rate goes high and I get scared while working out.
Get more from your training with the Garmin Forerunner 35 GPS Watch + Heart Rate Monitor. It offers wrist-based heart rate, all-day activity tracking, smart notifications, and vibration alerts. Available at REI, Satisfaction Guaranteed.
What Your Resting Heart Rate Can Reveal About Your Health – Fitbit Blog
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