This kind of session is used
to allow an athlete to run near to race pace,
or maybe even a little quicker, and to maintain
that pace over a distance that they might otherwise
find hard to achieve in training. If the interval
session, say for a 800m runner were to be -
3 x 600m with 10 minutes
between each set
and we were to hope that they could replicate
a race pace in each one this might be a bit too
hard. The athlete may achieve it on the first
run, but then find that the others were way off
the pace.