Marshall's military career, captain and deputy judge advocate on GW's staff, is well-known enough; but this little snippet came as a surprise:

Physically, he was gifted. Evidence of this physical prowess became obvious during the war years. As he traveled from the battle sites of the Revolution around Philadelphia, to his home in Richmond, VA, it was customary for him to walk the 250 miles, usually taking three weeks for the journey.8 As a competitor in camp contests, Smith says, Marshall was outstanding: “He excelled as a runner and according to numerous accounts he was the only man in the Continental Army who could high jump over six feet — a remarkable achievement in any era.”9 Standing six-feet-three-inches tall, he could have been, according to Marshall house docent E.L. Butterworth, an Olympic athlete in two sports.10

8 Smith, p. 68. [Jean Edward Smith, John Marshall — Definer of a Nation, New York: Henry Holt and Co., 1996]

9 Smith, p. 74.

10 E.L. Butterworth, in a tour lecture at the Marshall home, June 28, 2002.
Walking was probably a good way to decompress.