On the Charge 6, and I think this was the same on the 5, you cannot enable "Exercise Focus" to turn off notifications during exercise unless you enable Do Not Disturb. The Exercise Focus setting should not require DND to be enabled, since it should be conditional on using the Exercise app on the device.
Moderator edit: Clarified subject
If you enable DND and Exercise Focus, you have to go back and disable DND after your workout to receive notifications again. Users shouldn't have to do that - Exercise Focus should be enable-able without DND enabled, and should silence notifications while an exercise is being manually recorded on the device.
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