I started doing the 30 day challenge before Christmas me 1 week in I had lost 1kg. 10 days in I did a tendon in my ankle and that was the end of that, as I spent the next 3 weeks in pain and on bed rest.

I too struggled with it registering some punches and the kick backs. I did it barefoot, but thinking of doing it with shoes on the next time I get back into it.

BTW I did the tendon in by doing side lunges.