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The Principle of Specificity

Updated: Nov 8, 2021


"Specificity states that the body makes gains from exercise according to how the body exercises. This principle is important because applying it correctly will allow one to have a focused, efficient, effective program that will lead to the desired gains. Failing to apply it will result in wasted energy and time, and it will result in frustration as gains do not materialize.

When developing a conditioning program, you should consider the following:

  • the movements to be trained

  • the muscles and joints to be trained

  • the energy system(s) to be trained

  • the speed of movement


Back when I did 1:1 coaching, I didn't take on many trail clients. It is often presumed it was because I hate trails (not true, though I do prefer roads. I prefer truffle fries but will eat the plain ones if my husband is silly enough to leave his unprotected) and trail runners ( DEFINITELY not true!!!).


What I hate is having to beg a client to train on trails. Here is how the conversation often goes:


"Hey! I want to do a 50k. Let's go!"

"Most 50ks these days are on trails. Can you get to trails to train?"

"Why does that matter?"

"It matters. Principle of Specificity, crucial adaptations etc etc."

"No, but I have a treadmill and can get to trails on weekends my kids don't have soccer tournaments."

"We need you on trails like, every day. If the race is a technical course, then we need you on similar terrain constantly."

"But they are far! And I'll be slower at heart rate on the trails!"

"You sure you don't want to do 5 marathons in 6 months with Vanessa?"


If you wanna be a better tennis player, you gotta play tennis. If you wanna be a better basketball player, you gotta play basketball. You also need a coach and training plan that 1. addresses your weaknesses (for most runners this is strength and nutrition) and 2. prepares you for the demands of your chosen event.


The best way to throw a good plan out of the window is to ignore the Principle of Specificity and execute that plan in the wrong place.


In other words, if you wanna race on trails, you gotta train on trails. If the trails are hilly, you need to train on hilly trails. If the trails are hilly and covered in scree, guess what you need to do.

(There is NOTHING WRONG with getting your miles done on a treadmill under certain circumstances.)

As you plan your year ahead, I really need you to think carefully about the events on your calendar AS WELL AS your expectations for those events. If you want to run a fast marathon, we need you on roads. If you are looking to improve your time in a 50k, we need you on trails and in your PT's office frequently getting new strength plans, and working on nutrition is not optional it's required.


I could go on and on, but that's enough for now. When considering what events you want to do, please also consider the time and terrain available to train. #coachedandloved



Coach MK Fleming is the founder of Fitness Protection, LLCwhere she coaches all kinds of runners for $29 per month and gives marathon plans away for free. Click here to download her most popular training plan, Tenacious AF!

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