Tunnel Hill 100 Training Update

I signed up for the Tunnel Hill 100 mile ultramarathon without much forethought. If I’m good for anything it’s not thinking things through. But seeing that I was training for Ironman Chattanooga in September 2021 and doing the Big Hill Bonk Last Runner Standing event in August, I figured that the training load for Ironman and running 50K at the Big Hill Bonk would prepare me well for Tunnel Hill in November. I may have figured wrong. But we’ll see. There’s still plenty of weeks of training to go, and I’m sure I may see some improvements in endurance running as I creep closer to the ultra.


I saw a post on Facebook recently that asked what was harder, an Ironman or a 100-mile ultra, and the answers were interesting. In terms of the race itself, most declared that running 100 miles in a day was much tougher than completing an Ironman. But many also agreed that the training for Ironman was much harder than what people do to train for an ultra. I was troubled and glad to hear both of those responses.


I’m a little concerned that the run training that I am doing for Ironman is not going to be sufficient to get me to that 100-mile finish. I only got through 50K at Big Hill Bonk before tapping out. Maybe if the finish 4.16 miles in one-hour time constraint wasn’t in play there, I might have walked more and gone a little further. That time/distance format is a good indicator or predictor for an ultra as 4.16 miles in one hour will net you 100 miles in 24 hours. I was able to get a third of it in.


On my 2.5-hour training run today, I played with using run/walk intervals for the first time. I had played with that Galloway method probably twenty years ago, but I found that I would essentially pace way too fast for the run portion and not walk leisurely enough in the walk portion. I gave up on it and just went with what I knew best, running by feel and keeping an even pace.


I tried running for five minutes and then walking for one minute. That 5:1 ratio was working pretty well for me and I was averaging 10 min/mile pace, which nets a 20-hour 100 miler. When I turned around at 75 minutes I was at 7.75 miles, and by the time I finished the 2.5 hours I only netted 15 miles and felt pretty worn out. Not enough nutrition? Was the day warming up too much? Were the hills at the end causing me to slow down? Maybe, sure, all of the above, I dunno.


To do 100 miles in 20 hours you need to hit five miles every hour, and I did that today. Maybe if I run the 5:1 ratio until I hit five miles, I could have more time to walk out the remaining minutes of the hour. I will give that a go next time. I’m also considering lowering the ratio to four minutes of running and one minute of walking and see how that goes. There is still time to play with the run:walk ratio.


Thoughts of dropping down to the 50-mile ultra have been entering my head, but I’m not giving up just yet. I just need to dial it in a little better and see where it takes me.

Author: Ironman Chris

Family, running, triathlon and drumming are my things.

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