You Want to Measure Your Energy Expenditures?

A group of people ran from Los Angeles to Washington, D.C. on foot a marathon a day six days a week for five months. Their energy expenditures were compared to other big events that have been looked at like the Tour de France or Kona Ironman. There's no event that last nine months that anybody's ever been able to maintain a higher expenditure for than pregnancy. And it ends up being a really clean, clear ceiling of what you can do.