"The gravel space and environment has changed a lot, going back just four years. The beauty of it for me was that you could have a pretty balanced lifestyle, still be competitive - you weren't doing 30 to 40-hour weeks."
What started as a way for bored SI editors to amuse themselves during the slow period of the sports calendar soon grew into an annual event capable of subsidizing much of the rest of the magazine.
After becoming the sixth golfer to complete a career grand slam with his win at the Masters, Rory McIlroy's private jet departed Augusta the next day.
"On the field, everything is about focus and precision. But outside of this rigorous environment, Enigma Mass provides a unique opportunity to express oneself differently."