moderate
light Intensity A+
Walking briskly is a good aerobic workout. The winds blew briskly and the sailboat picked up speed.
Endurance
Look it up in a dictionary! You can say walking briskly which would mean not hesitating/walking quite fast So I would say that it meant fast or quite fast! x
I believe they are called vigorous exercise.
That gives 3 dB more total intensity level.
intensity level
moderate intensity
intensity level
intensity level
vigorous intensity