I was recently tempted by an ad about Airofit. It is a connected device which should help you to improve your breathing capacity.
I don't really know how to call such device? Would it help for hiking? I am 42 and my capacity is not great, since I only hike in late/spring and summer and only do weights lifting in winter. Experience about running and other cardio is also welcome.
Does this kind of devices worse it ? Does it compare to altitude breath training ?