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You fly out at 6:40 a.m., sit through a full day of meetings, and land home close to midnight. The next morning, the routine you've kept for six months — the walk, the quiet breakfast, the supplement with your coffee...

Every January, gyms fill up. By mid-February, most of the new members are gone. The programs weren't wrong — five days a week of structured training genuinely works. The problem is that almost nobody is still running that program in...