For someone like Ramy Ashour, a top-ranked player on the professional squash circuit who travels two or three times every month of the year, the key to success on the courts is adaptability. “You have to get comfortable with being uncomfortable,” he says with a laugh.

He’s had plenty of practice. Mr. Ashour has been playing in international tournaments since he was 6. In 2010, he became one of the youngest players to reach a world No. 1 ranking and is currently ranked 5th after a big win at the men’s world squash championship...