Believe it or not, Mastro's favourite workout doesn't involve a snowboard — or even snow, for that matter. "My favourite workout is cross training," she told NBC Olympics. "I love doing different sports, getting outside, and still being able to get a workout."
Mastro played competitive football until the age of 16, when she had to decide between pursuing football or snowboarding full time. While she chose the latter, she credits football for teaching her how to think fast on her feet, and it's one of the many sports that make up her cross-training regimen today. She also surfs, plays tennis, wakesurfs, and has recently gotten into mountain biking.