Negative Splits – Positive Thoughts

, ,

Garmin - lap 1Workout #1: Endurance Run with negative split
Type: Run Planned Duration: 1:20
Description: 15 min gradual warm-up, the keep effort in check, last 15:00=steady state effort (aim for ~half marathon pace, strong and steady)

As I was “gradually” warming up, I started thinking about my target pace for the run. I was thinking 8:40/8:45 for the first 1:05:00 and then maybe 8:25/8:30 for the 15:00 negative split.  Do-able, I thought.

About 15 minutes into the run, I realized that my pace was under 8:40 and feeling like pretty low effort.  I started to worry that I was going too fast and that I wasn’t going to have enough left in the tank for the negative split. This is also when I realized that I have this worry a lot.

Mental instruction review: “keep effort in check”.  Ok, I decided to primarily pay attention to my heart rate (note: I haven’t used heart rate for training before).  I decided that I felt like my effort was in check around 142 bpm – high 130s on the flats/downhills and up to 145 on the uphill.  It felt like a happy run.  25 min into the run, my pace was down to 8:29, but my heart rate was “in check”.  I started my worrying again and trying to figure out why this was happening.  Maybe it was just one of  those really great runs.  Maybe it was just the perfect temperature – I do love 45 degrees. Maybe I was getting stronger.  maybe I didn’t go as hard as I thought I had on the computrainer the day before. Whatever it was I decided to try to just accept  it and enjoy it.  I was keeping my effort in check, I kept telling myself that I’d have plenty in the tank for the negative split. (And it was pretty awesome.)

The course was an out-and-back.  At the turn around, I was still feeling strong, fast and still pretty awesome. And then it hit me; woosh!   Damn, it was a tailwind!

As I turned into a full face of cold wind, it was so clear I laughed out loud. With all my theories and worries I,  tailwind never came close to crossing my mind. Wow! What a dope slap. (I’m still cracking myself up.)

On the return, I kept my plan and maintained the same effort level.  I watched my pace creep up, of course. And I had to fight my impulse to kick it up to keep the faster pace showing on my Garmin. Every workout has a purpose – this workout was a negative split at 1/2 marathon pace, so killing myself for the Garmin display’s sake, was the wrong choice. I finished the split and maintained my 142 bpm average.  Pace: 8:37 for the first split.

Garmin - lap 2The negative split  portion of the run was almost a loop, so I assumed the wind would be heads & tails.  I decided to run the negative split by heart rate vs. pure pace and targeted between 145 & 150 bpm for an average pace – which seemed like a reasonable bump up for simulating a 1/2 Marathon race pace.  (I was completely making this up, too – I have no idea what my heart rate has ever been in a 1/2.)  It panned out interestingly.  My pace was 8:10 – which was lower than the 8:25 I had guesstimated.  But I felt great – had plenty in the tank and was feeling pretty awesome again.

I can’t actually recall a single time when I completely emptied the tank and run out of energy to finish. And still, I’m always worrying about “saving enough to finish”.  I think that in this realization, there’s a huge opportunity for me to train differently.  If I want to go faster (which I do), I think it’s time to start using something other than moving pace – and saving enough to finish as my primary metrics.

Let the research begin – HR, Power, Thresholds – bring it on! Any suggestions for books, websites, or places to start?

3 responses to “Negative Splits – Positive Thoughts”

  1. […] Negative Splits – Positive Thoughts. […]

  2. Great post, and from what it sounds like, great run as well. I reckon that a negative split can be measured on pace (GPS) or effort (perceived) level. Training your mind as well as your legs to keep the effort high at the end of a race is important.

    Joe Friel has several blog posts about Negative Splitting. This is the best source I have come across so far.

    1. Thanks, Steve. I just visited Joe’s blog for the first time yesterday. I was just looking for a good overview resource for triathlon training. I’m going to check back for negative splits.
      Thanks!

Thoughts?

This site uses Akismet to reduce spam. Learn how your comment data is processed.

About Me

I’m Alex, the creator and author behind this blog. I’m a wonderer.