Fitness vs. Endurance

There was a thought provoking post today on the blog "Hanging in BOCO" (written by John Shilt). The post brought up the following questions, for me:

- What is fitness?
- What is endurance?
- What is the difference?
- How does that difference apply to Ironman?

I have all kinds of thoughts on the subject, but go read his blog, it seems to be presented in a clear way. Here's a link: Learning, Understanding, and Believing

The one quote I want to highlight from the post is this one:

Endurance (in IM) is being able to race for 8 to 11hrs with efforts at AeT to AeT+10 without your pace and power declining.

I believe that if an Ironman athlete can fully understand that concept and then allow that principle to influence their training (opposed to training partners, daily speeds, etc), then they are on the narrow path to reaching their Ironman potential.

This season I have tried my best to manage my fears, doubts and anxieties while training what appears "sub-optimal" and feel that I have succeeded 85% of the time. That discipline alone gives me confidence heading into Ironman Wisconsin. That along with the fitness tests and other fitness markers that seem to be improving as I head into the final weeks.

Example: Yesterday's workout - 4.5 hour bike, managed my effort on the bike to be under AeT (135bpm) for almost the entire ride (hit 150bpm 2x on climbs), saw pace increase as ride continued despite temps reaching 92 degrees and heat index reaching 100. Got home and went out for a 30 minute transition run.

Nikki warned me to be careful due to the heat (she had just finished her workout earlier). I took off and ran at AeT for the first mile, then ran the rest at AeT + 5 bpm. My average pace was 7:58!

Not fast you say - I know. But when you consider that I have run very few miles under 8 mins pace all year, this workout came at the end of a 9 day "on" cycle, the heat was keeping heart rates high and I had just finished a 70+ mile ride, I feel pretty happy with what occurred.

The other positive is that some of my best 3 mile fitness tests this year have been around the 8 min/mile pace.

To put all this into the context of John's post, I hope that I am witnessing a good amount of fitness being transferred into a great level of endurance.