10 years ago I wrote an article called “Get Your Bound Out” for the now defunct In the article, I advocated for the use of bounds to develop overall running speed and power based on the even older article by Frank Dick called “Development of Maximum Sprinting Speed”.

The article had some great charts that had conversions of different times in different distance and how they would convert to race distances. This was great since most of my season is indoors and it is helpful to tell an athlete if you run a certain time in a shorter distance, it would convert to a certain 100m time. He also did the same conversion with a 1,3 and 5 step bounds.

For the year that I used it, it worked for me. I had a state champion who bounded well and the charts fit to his abilities. I had some athletes not quite as fast and they also fell into to appropriate categories based on his predictions. But, after that some things changed.

I had some faster athletes (Olympic medalists) come through and I used the bounds as an assessment tool. Even though they were faster than my previous athlete (quite a bit), they did not hit marks that were on Dick’s chart. One wasn’t even close and he was the fastest of the bunch. It caused me to question my thoughts. As more athletes made their way through, bounds did not look to be the magic bullet that I was hoping for and I stopped using them.

Jump ahead 10 years. I was having a conversation with Joel Smith of and we were discussing bounds. He was a jumper in a previous life and loves bounds, plyos, etc. We both thought that we really couldn’t find a use for them in the world of acceleration due to long contact times, heel strikes in front of the body and different body angles between a start and a bound which could require different muscles to work.

After our conversation, I decided to test out what we were thinking and challenge my old article.

I rolled my 1080 out to see what actually happens. As many of you know, the 1080 can effectively measure horizontal force, power and I can get a feel for ground contact time.

I measured 3 athletes who were well trained and “explosive”, athletes who have very high vertical jumps. I had them run 10 m acceleration from a 2 point stance. The 1080 measured power output and contact time. I then had them bound for 10m.

The following graphs are from the web app that comes with the 1080. The top line in all 3 graphs is the sprint line. The bottom line is the bound line. What is interesting is that the force numbers (creates momentum) are similar but once the mass gets moving, the power drops off considerably. This could be because there is a lack of acceleration in the bound. The longer peak on the bottom line shows a longer contact time.

What this may show is that if we are looking to develop acceleration, maybe the bound is not the exercise that I hoped it was. Maybe, if we are looking to improve acceleration, we should work on acceleration instead of using other exercises to try to overload.

If we added resistance to the acceleration, it created much greater power output numbers. But, if the athlete lacks the proper body angles or foot placement, the power numbers start to drop.

More to come on this…

Showing 4 comments
  • Nicky Miranda

    Chris, Love your stuff thanks! I had a random question about baseball athletes. Baseball is acceleration dominant (most runs less than 30yds), so where do you value the importance of fly-10’s for baseball athletes? Basically, would fly 10s still be the bread-and-butter exercise even for baseball athletes?

    • Chris Korfist

      If you don’t ever reach or find a top speed, you won’t know how to get there. It is neurologic development.

  • Anthony Holler

    I like Chris’s answer. In my experience, the best way to improve acceleration is max-speed sprinting. Our fastest sprinters are almost always our fastest to 20m, 30m, 40m, 50m, etc. Slow runners are weak at acceleration. Too many coaches use the “acceleration is all that matters” to justify staying in the weight room and the avoidance of sprinting.

  • Chris Korfist

    I am going to leave it at that because I have an article coming out on this topic.