stand up for the first time (once up)
fall down get back up (once down twice up)
fall down get back uo (twice down 3 times up)
fall down get back up (3 times down 4 times up)
fall down get back up (4 times down 5 times up)
fall down get back up (5 times down 6 times up)
fall down get back up (6 times down 7 times up)
fall down get back up (7 times down 8 times up)

Of course you were born down, before you got up the first time. So overall you were down 8 times and up 8 times. But the saying is "if you fall down 7 times get up 8 times.
The first time down wasn't a fall.
If you fall down 7 timees and don't get up for the 8th time, it's all over.