Hi,
I am former kenpo practicitioner who has gone from kenpo to kickboxing. I have trained in kenpo for many years (since I was 5) and my knowledge and skill in martial arts is quite above average for someone of my age (15). However one thing that was not worked on enough at my old school was stamina, as we didnt contact spar and rarely point sparred. Now that im in the ring almost ever class (although do to my school/after school schedule and no car im not there as often as i would like) i gas out towards the end of the 2nd round. This is very frustrating as the other sport i particpate in is rowing, a very endurance based sport if you do not already know. My question is how to train for stamina in the ring, outside the ring. Any programs people follow, exercises i should try, or programs emphising intensity rather then duration would be greatly apreciated.