Sanders held one rally after another, interspersed with TV appearances. Ventura, Pomona, and Jimmy Kimmel on Thursday; Long Beach, Inglewood, the Young Turks and Bill Maher on Friday; Santa Barbara, Santa Maria and Bakersfield on Saturday; Visalia and Fresno on Sunday; a few stops in Oakland on Monday.

...“Most candidates half his age would strain under the weight of that schedule. There was one day where he hit five or six states in a single day. I really don’t understand how he does it,” the staffer said.

...His wife, Jane, described her husband as “just one of those people who is built to keep going.” He has been sick fewer than half a dozen times in their 28-year marriage, she said, and she credits his endurance to the fact that he was a competitive runner in high school.

...But mostly, she says, he is fueled by a lifelong feeling that you have to cram as much into a day as possible. “I first met him when he was mayor of Burlington,” she says, and even back then “he was always saying, ‘We have to accomplish this now because we don’t know how long we’ll be here.’ So he’s always pushing for a fuller day” of events.

https://www.yahoo.com/news/energizer-bernie-does-sanders-keep-000000095.html