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Training for (+ completion) a 1st marathon turns back vascular age 4 years? https://t.co/zVUyNQhlJL @JACCJournals by @dr_manisty and colleagues @BartsCardiac @NHSBartsHealth Editorial https://t.co/nyyca0A3oP by @JulioChirinosMd @PennMedicine https://t.co/