Should Marsh find himself short of inspiration, he need only glance at his batting gloves.
There, scrawled in black marker pen, is the word "Chemo" - a reference to the bond he has forged with several young cancer patients in Perth.
For more than a year Marsh has worked with "The Chemo Club", a joint initiative between Aspire Gym and SolarisCare which encourages those undergoing chemotherapy to exercise in a bid to help their recovery. Justin Langer also has close ties to the group.
For Marsh the simple five-letter message on his gloves serves not only as a tribute to the kids with whom he is particularly close, but also as a source of inspiration. "To me it just keeps things in perspective," Marsh said. "No matter how hard I might think I have it, I only have to look at the gloves and that message and think about what they're going through, and know that what I face is really nothing."