Please add Boxing as an activity.. there is so many obscure ones on the list and Boxing is ever increasing and is not necessarily an Indoor Cardio as Boxing is not always a cardio activity, especially as being taught technique etc. for actual Amateur boxing. Could be relevant to add a Combat Sport section and add Boxing, MMA, Martial Arts etc. As all are activities and they don't necessarily fall under a cardio or exercise activity.
I do not know what device you use, but on most watch models, you can create a custom type activity, and name it accordingly. In Garmin Connect, on the Activities page, it will then appear with your chosen name in the title, in the category "Other". And if you have more of different activity types of the category "Other", you can filter them out with the help of the search box.
