I’m sitting on another ten-hour   Delta Air Lines  flight—this time headed to Honolulu, Hawaii for a two-day layover before continuing on to Australia (another ten hours). Surprisingly, this one doesn't feel so bad. Maybe because last month I survived a sixteen-hour flight to Johannesburg, South Africa. Between these two marathon trips, I was back home in Atlanta, settled into my familiar morning routine—meditation, coffee, gym. At the gym (I go to   Orangetheory Fitness ), my coach, Koko,...