Most of the replies have been directed at giving you a larger gas tank -- i.e. increasing your stamina. That's important to be sure, but another valuable thing to do is to increase your mileage. That's to say, try to become more relaxed and efficient.
As an older martial artist, I find that this is at least equally important to keep up with the young bucks. As your technique improves, you can do more with less. Of course this is very heavily emphasized in my core art, Ving Tsun, but I believe you can observe a significant increase in efficiency in the movements of masters of any art.
As an older martial artist, I find that this is at least equally important to keep up with the young bucks. As your technique improves, you can do more with less. Of course this is very heavily emphasized in my core art, Ving Tsun, but I believe you can observe a significant increase in efficiency in the movements of masters of any art.