Hi

I have been doing freestyle kickboxing for about 3 years (probably only 2 in total due to injuries).
I do a lot of sparring but haven't competed much and up until recently I only competed in semi contact.
I entered a light contiuous competition recently and made it to the final. The heats were 1 * 2 minute round, I was exhausted by the end of each round. The final was 2 * 2 minute rounds and by half way through the second round, I couldn't even keep a guard up.
I am reasonably fit, training twice a week with a lot of emphasis on fitness and at least 10 rounds of sparring (mixture of continuous and semi contact)each session.
Why do you think I was so exhausted after only 2 minutes (I did a 50 round marathon session before christmas).
What is the best type of fitness training for this type of competition? My guess is a mixture of aerobic and an-aerobic, but should I concentrate on 1 of them.
Maybe I am wasting too much energy during the fight, I am quite tense in the shoulders and I do move around on my toes a lot.
Any help apreciated.

Cheers

Paul