(UNESP - 2011/2 - 1a fase) I started to run becaus

(UNESP - 2011/2 - 1a fase)

    I started to run because I felt desperately unfit. But the
biggest pay-off for me was – and still is – the deep relaxation
that I achieve by taking exercise. It tires me out but I find that it
does calm me down. When I started running seven years ago, I
could manage only 400 meters before I had to stop. Breathless
and aching, I walked the next quarter of a mile, alternating
these two activities for a couple of kilometers.
    When I started to jog I never dreamt of running in a
marathon, but a few years later I realized that if I trained for
it, the London Marathon, one of the biggest British sporting
events, would be within my reach. My story shows that an unfit
39-year-old, as I was when I started running, who had taken
no serious exercise for twenty years, can do the marathon –
and that this is a sport in which women can beat men. But is it
crazy to do it? Does it make sense to run in the expectation of
becoming healthier?
    My advice is: if you are under forty, healthy and feel well,
you can begin as I did by jogging gently until you are out of
breath, then walking, and alternating the two for about three
kilometers. Build up the jogging in stages until you can do the
whole distance comfortably.
(Headway Intermediate – Student’s Book. Oxford University Press.
Adaptado.)

Assinale a alternativa correta.