For me the preparation step up from 100km to 100miles is similar to the step up from running a marathon to running 100kms. The physical training wasn’t all that different to what I would do for 100kms, although I did put in a more intense few weeks about 16 weeks out to really build up base mileage and get plenty of toughness in my legs. I also focused almost exclusively on trail hill running for 3 weeks about 5 weeks out from race day (but this is just specific training for the event in mind which I would recommend for any race)
What I found different was in the mental preparation for 100miles. Many months were spent rehearsing for the event in my head, and coming to terms with the appreciation that 100miles is pretty much double 100kms, or at least it will feel that way.
The other key thing was that DNF was not an option because it takes so long to train for 100 miles and that a second chance for this event would be another 12 months off and that was not a time I was happy to wait. So I had to adopt a no excuses mindset, prepare for discomfort and have a strategy that would get me to the finish.
When running 100m over 100kms, pacing is all important. You blow up early in a 100 miler and it’s going to be a long day at the office. This was especially relevant for GNW 100 as it was hot and humid.
My normal ultra strategy is to walk all the hills and run the flats and the downs. The trouble is that on race day you can get dragged along by the crowd and you find yourself running someone else’s strategy, not your own.
By walking early in a 100 miler instead of running you may delay your arrival at the next checkpoint by a few minutes, but you will increase your chances of crossing the finish line which is always the primary goal. You have to appreciate that walking doesn’t mean your pace drops to zero, you may only be a couple of minutes a km slower than you would be running anyway, so the time lost could be negligible. And what is 15 minutes when you’re out running for 24hours+.
As with all things ultra running related, you need to have a pace strategy, and be prepared to adapt it to suit conditions. And for a 100mile race you are going to have to be patient, it’s just too long to rush things no matter what your ability.
For example, if it is especially hot you may want to take it easy through the heat of the day and focus on keeping hydrated, and then as the heat drops of push the pace a little. It leads us to another “P”, preservation, you simply have to preserve what you have to keep you moving forward, and this takes patience.
Everyone who has completed a 100mile event has had to go through some tough miles, and I can guarantee you won’t finish without bucket loads of perseverance and persistence. No matter how much you train and how well you prepare you are going to have the urge to slow down and stop, but you must persevere. This for me is the essence of running 100miles.
The difference from running 100km is that the periods that you require perseverance are far longer and far tougher, and that takes immense mental fortitude. Which leads us to...
Without doubt the biggest difference between running 100km and 100 miles is in your mindset. In fact all of the above “P’s” are basically psychologically based.
In a 100km race you will go through many mental ups and downs, and you will find your subconscious throwing up all manner of excuses for you to drop out before the finish line. In a 100mile event these ups and downs are deeper and stronger and tend to last longer. You can find you get absorbed in a mental tug of war with yourself for many hours.
Being aware of this you could try including it into your training. By this I mean embracing pain, tiredness and negative thoughts, and seeing it as a challenge that you will overcome. As with all things, when you have done it once, it becomes easier next time. This is why the likes of Ann Trason, Pam Reed, Scott Jurek, Marshal Ulrich, Dean Karnazes and countless other ultrarunners seem to be able to run on forever – they have become used to the discomfort which may have stopped them years earlier.
So if I had to define the difference between 100kms and 100miles, I’d probably say that it’s not all that different, just a whole lot harder, far more than twice as hard. You have to be mentally tougher, more controlled, more disciplined and be prepared to maintain that for twice as long!
“If you’re going through hell, keep going” - Winston Churchill