It is very comfortable for me to run outdoors and on a treadmill. But it's not very convenient for me to adjust the angle directly on my arm when I need to touch something on the phone every now and then while running. Also, I usually wear the band for 40-60 minutes every time I do exercises, it's not always very comfortable (a bit tight, but if I don't tighten it enough on my arm, it can easily slip off).
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