Interesting discussion. I can sympathize with track coaches though when insecure strength coaches use the “linear speed” argument and the “it only works with track athletes” argument. Being both a track/sprint coach and a University strength coach, I can tell you that these arguments about “track coaches” in general are a knee jerk reaction.
Granted, there are some pretty crappy track coaches out there who don’t know how to coach linear sprinting, let alone concepts related to team sports. However, having worked with football players, basketball players, hockey players, soccer players, etc., good linear sprint coaching can take you a long way in sports. One athlete I worked with on linear sprinting (he ran 100’s and 200’s) was one of the best kick returners in the league after our season together. Believe it or not, there is a lot of linear running in sports. Everyone is not running figure-8’s all over the field with their pants on fire.
I’d take a top sprint coach any day over a weight room guy to help with team speed. Pulling sleds haphazardly can improve any individual who doesn’t have any real training behind them. It’s kind of like the Jumpsoles marketing technique - “Do training with our product and you’ll get better.” When the real reason people are getting better is that they are actually “doing the training.”
My experience with sled work is that we get the best benefit using the sled for postural adjustments (i.e. body lean for acceleration). We use very little weight to achieve this end. In many cases, the weight of the sled is enough (10kg). Obviously, the friction of the surface - track vs. turf - can play a role in how much weight you use.
We recently had a guy come in to test our athletes with some new gadget. It has a sensor on a belt that can sense (using a gyroscope and 3-D dynamometers) ground contact time, stride length, stride frequency, vertical force and horizontal force. I’m not sure how accurate it was, but we did notice some significant results between non-resisted sprints over 30m and sled pulls over 20m in terms of ground contact time, stride frequency and stride length. And, the sled we used was no more than 12-15kg max. (BTW - I’ll do a lengthy post on the gadget and post the excel results for discussion purposes).
So, as Charlie has advised, be very careful of the way you use your sled. Use it sparingly. Leave the plowing of fields to the farm animals, and let the thoroughbreds run.
For the record, I do find much of Boyle’s article misleading. I don’t think he fully understands the implications of using a sled or the concepts of speed training. Sure sports is about acceleration. But implying that speed is not important is misleading. How does he think top sprinters get to top speed??? Are they somehow bypassing the acceleration phase? Reggie Bush ran track. Bob Hayes ran track. And I’m sure most of the NFL’s top athletes ran track in high school, and learned basic sprint mechanics for both acceleration and max speed. Is Boyle somehow implying that this was not a useful stage of development? And, I’m sure many of them did not use sleds to achieve their acceleration and top speed abilities.
Like many strength coaches I come across, they spend more time in their articles trying to justify their methods by belittling others and other methods (i.e. Olympic lifting coaches don’t know how to coach for team sports, sprint coaches can’t help in team sports). Give us your reasons for doing what you do and let them stand alone on their merit. In one of Charlie’s seminars back in 2001, he went over the merits of linear sprint training for team sports (all of which made perfect sense) and he included the concept of foot elasticity for agility as it is developed by sprinting. Why can’t the conditioning community accept the basic, well-grounded answers and go with it. The internet has allowed strength coaches to proliferate their ‘thoughts’ on a daily and weekly basis to the detriment of athlete development and common sense. Results are what we are looking for, not more blog entries and articles.