All distances longer than the marathon(50K,100K,24 hours, ...) are ultraruns.
Ultra-runners are at their best at these distances or find it a challenge to
run them. I was a modest marathon runner (PB:2h25) but at the distance of
100km I was at my best and had a successful career.
No, ultra-runners are free to participate in marathons and even shorter
distances without being expelled. In my country they even organize the
Marathon-& Ultracup(Dutch) where every distance runner is welcome. However
we must warn for the danger of addiction once one has participated in an
ultrarun, although it's not scientifically proved that it's contagious.
In spite
of what is often said and heard my time of 6 hrs 03'51" is a proven
fact and officially
recognized by the V.W.J.L., the only official federation for ultra-runners at
that time in Belgium(Flanders). The course was properly measured and that
night time went as fast as it usually does.
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