Athletics is an essential component of the Marvelwood's overall educational curriculum. The program seeks to teach and instruct students in the rules, fundamentals, and skills necessary to participate in various team and individual sports. Athletic participation provides both physical training and a suitable outlet for youthful energy. Competition within and between schools encourages principles of good sportsmanship and fair play, and fosters the spirit of amateur competition as well as school pride.
Marvelwood students participate in a sport or an activity each of the three terms of the academic year. There are a total of seventeen teams in eleven different sports, including soccer, volleyball, cross country, basketball, wrestling, alpine skiing, lacrosse, baseball, softball, tennis, golf, and ultimate frisbee. In addition, there are a number of non-competitive athletic options in the Outdoor Adventure Program, which includes mountain biking, hiking, recreational skiing/snowboarding, rock climbing, and canoeing.