I get tired through the second game:
I am afraid that my answer is not what you wish to hear, but nevertheless, I will say it anyway.
Squash is unique, because it requires its participants to blend four different fitness categories such as aerobic fitness, flexibility, strength, mental strength. There is a saying that goes, "Get fit to play squash,dont play squash to get fit". A truer word was never said. Squash is one of the most intense sports disciplines. It is a fast and exciting game. It is a battle to win control of the court and secure positional advantage. Squash involves explosive movement to the left to the right dorwards and backwards around the court. It involves start stop and changing direction. Perhaps all that in one rally. To play squash at a decent level, fitness must be high. Let me break that down a bit further. Players need to have aerobic fitness to allow them to run and swing for an hour or more, flexibility to reach drives deep down the wall and tight drop shots, strength to control their racket and hit the ball with power, and mental strength to "stay in" a long match. A good squash training program should help to strengthen all of these requirements of a player's game, and players should also be willing to focus more exclusively on those aspects of their squash fitness that are weak. So, I suggest that you train each aspect of your game by using a good coach, and hopefully you will see something here that will make you a more complete player. Good luck and enjoy your training!