On Saturday, Patrick Clancy will take part in the marathon at the Baltimore Running Festival. On Sunday morning, he'll compete in a 10K (6.2 miles) in Arlington, Va. And then?
"I'm going to sit on the couch and watch football," he said.
Few runners of his ilk attempt to race on successive days. But the 31-year-old financial analyst has done the math and will give it a go.
"Unless it's real hot on Saturday, my legs should be OK," said Clancy, who lives in Arlington. "I've done three marathons but have never run any distance afterward for three or four days. I know I'll be really, really tired."
He hadn't planned to double up. After entering the 26.2-mile Baltimore Marathon, Clancy learned that the Marine Corps Marathon 10K was the following day. Having also run it last year to raise funds for the American Red Cross, he felt obliged to go again.
"People have really struggled with all of these natural disasters," he said. "I thought, if the country can get through back-to-back hurricanes [Harvey and Irma], then I can get through back-to-back races."
That doesn't surprise Lisa Futterman, an event specialist for the Red Cross and an acquaintance of Clancy's.
"I didn't have to drag him into running the 10K. Patrick has already surpassed his fundraising goal," said Futterman, 28, of Arlington. "How will he do it? I ran a marathon several years ago and couldn't walk the next day. But this is very much his style."
Clancy has completed a Marine Corps Marathon and others in Richmond, Va., and New York, where, in 2015, he posted his best time (4 hours, 5 minutes).
"I'm not the fastest person out there," he said. "I just like to stay active."
Friends call him "Crazy Clance" because he can't sit still. Weekdays, before work, he'll lift weights for an hour; evenings, he'll run 5 miles. On the job, he'll often stand instead of sit.
Last weekend, he attended a late-night bachelor party in Charleston, S.C., then awoke at 8 a.m. to run 5 miles. Several months ago, on the morning of a friend's wedding in Saint Martin, Clancy jogged several miles on the beach, then lifted weights.
"People ask, 'Do you sleep? Do you ever sit and do nothing?' No, I don't," he said. "Look, I still have energy left, so I may as well use it while it's still available."
Even on Friday, the day before the marathon, Clancy has whirlwind plans. He and his parents plan to take a behind-the-scenes tour of Camden Yards, then visit Fort McHenry and other attractions.
"I'm of the opinion that you don't want to sit too long, or you'll get tight in the hips," he said.