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Dr. oz about the demands of the campaign. the campaign trail is really not conducive to good health habits, but what i try to do as much as i can is walk. i m a big walker. reporter: and he s a famously hard-running candidate, as he showed against hillary clinton in 2016. but i think the secretary is right. and that is that the american people are sick and tired of hearing about your damn emails. thank you. me, too. me, too. reporter: sanders can typically pack three or four events into a day in multiple cities, not missing a beat when he suffered a gash from shower door last march. but he took a short break after the last debate. in the united states of america, we are spending twice as much per capita on health care reporter: tonight, sanders democratic rivals are wishing him a quick recovery. i know everyone here wishes him well, wants to see him strong and back on the trail as soon as possible. reporter: and late this afternoon, sanders tweeting his ....