Just completed the second week of using the POWERbreathe unit.
1) I have been gradually moving up the setting scale and am now on a setting of 3.5 which feels like that is just about the point where I am failing to achieve the full 30 breaths.
2) As the resistance increases the effort required it has started to feel uncomfortable around my face and neck.
3) I don't yet have an opinion on whether the exercise is changing my performance in any way, but early days yet.
4) In the past I have always felt that at this time of year my breathing becomes a greater limit to my performance than in summer, so proceeding with interest.