"Either way, if you're going to run a first marathon, or start a first company, you're inexperienced," Grinna said.
To succeed in both, it's vital to recruit the right people — colleagues and running buddies. "If you're going to be successful, you have to surround yourself with a great team," he said.
Grinna ran with three other CEOs after Technology Underwriting Greater Good, or TUGG, recruited them. The nonprofit organization received the entries to the race as a thank you for fundraising it did for victims of the 2013 Boston Marathon bombings.
To prepare, Grinna said he set clear goals and developed a plan. "You might have an idea of what you're going to accomplish, but the only way you're going to be able to do it is to surround yourself with the right people," he said.