If you ask fans of the Avett Brothers what they love most about the band, they will likely mention the electrifying energy that the folk rockers famously exude during live shows.

If you ask fans of the Avett Brothers what they love most about the band, they will likely mention the electrifying energy that the folk rockers famously exude during live shows.

The Concord, North Carolina, band - made up of actual brothers Seth and Scott Avett (lead and backing vocals, guitar and other instruments), and honorary brothers Bob Crawford (backing vocals, upright bass) and Joe Kwon (cello), and touring members Mike Marsh, Paul Defiglia and Tania Elizabeth -has cultivated a huge following thanks in large part to their stage presence and infectious enthusiasm.

Which begs the question: After more than a decade of touring together, how do the Brothers maintain that liveliness night after night on the road?

"A big part of it for me is exercise. I try to get exercise on the road to stay healthy and as fit as possible. And that's hard to do sometimes," explained Bob Crawford by phone last month during a short break in their expansive U.S. tour (which stops in Columbus at the LC on Friday, Aug. 21).

"I still get up there and look at [my bandmates], and, we were in Houston, New Orleans and Birmingham this week, and it was 100 degrees every day. It was so hot that it was just hard to move, and it really takes a toll on you. And they were still on stage moving 90 miles an hour."

The band's secret? "You try to preserve your energy before you go on," Crawford said. "What we decided is it's good to be almost asleep before we go up on stage. It's good to be really tired before you go on stage because then you can just turn it around really quick. And hopefully, the songs themselves do a lot of the work for us."

Since forming in the early 2000s, the Brothers have released eight albums, including their latest, 2013's Magpie and the Dandelian, and they are currently wrapping up work on a new LP. But for now, the focus is still on touring, which, Crawford said, can be a grueling but rewarding experience.

"It's important to not complain about the wear and tear of travel, because we're really blessed to be able to do what we do," he said. "There are little things here and there ... that are tough. You never rest well. Even if you have a day off at the hotel, you never rest, [but] we get to do something that so few people are privileged to do, and we can't ever forget how special an opportunity this is we've been given."

The hardest part about life on the road, Crawford said, has been spending time away from his family - especially his five-year-old daughter, Hallie, who was diagnosed with a brain tumor in 2011 at age two. After surgery (which removed much of the right side of her brain), chemotherapy, and radiation treatment at St. Jude Children's Hospital, she is "doing really great" and has been cancer-free for two years, Crawford said.

"Two years off treatment, we're seeing her grow," he added. "It's one day at a time. She'll start kindergarten at the end of August, which we never imagined would happen. I mean, we prayed for it but we were so locked in the battle of one day at a time, and that never goes away."

Crawford said that the support of his bandmates helped him through the tougher times. "The whole experience has made me a much more spiritual person, and more grateful of all that I have ... Also, the love that we all share in the group. I'm very conscious - hyper aware - that this won't last forever."

Reflecting on the band's success, he added: "There will a day where we lay down our keep and don't play together anymore. So every show, you kind of have the sense of, 'OK, how many of these are left?' It doesn't have to be a morbid or dark thought. But our music career will come to an end, and, in the meantime, we get to do an amazing job with people we care so much about."