Activio Indoor Cycling 75 minutes

Today, I attended the weekly Activio indoor cycling class as usual. It lasted for 75 minutes instead of 60 minutes.
The workout contained four intervals lasting for 15 minutes each. We mainly kept the heart rate in the yellow zone with both low and high cadence throughout the intervals.

I felt great and strong and managed to peak into the red zone in the end of all intervals. At most, I peaked at 96 percent of my max heart rate.