The biggest question in running is how to run properly?
Good news is the science is settled that the safest, most efficient way to run is to avoid landing heel-first, and instead land with a forefoot strike! This is because forefoot running does a significantly better job at helping you avoid damaging impact burdens altogether. An additional mechanical factor that also helps keep impact low and energy efficiency high, especially at faster running speeds, is to lean slightly forward.

Research in the journal Biomechanics found that faster, more economical runners had one consistent common denomination: they all maintained a forward lean.
The researchers found that forward learning during running drew in the landing foot to land closer to the center of mass (upper body) which in turn allowed the center of mass to move farther ahead more quickly as compared with an upright body posture which produced a longer brake force duration period and was more straining on the knee. What is more, the researchers found that forward leaning during running not only effectively shaved down the brake force, but also reduced propulsion forces which resulted in less mechanical work and muscle power to thrust the body forward. This also expended less metabolic energy.


These findings add new weight to the growing idea that to improve your running economy while maximizing the benefit of running with a forefoot strike, leaning slightly forward has a strong positive effect on producing smoother, safer strides with reduced energy costs. However, a forefoot strike during running is only very effective if used properly! Here’s a video showing a proper forefoot strike and the functional relevance as this movement path of the foot.
References:
Krugler F and Janshen L. Body position determines propulsive forces in accelerated running. J Biomech, 2010;43:343-348.
If you’ve enjoyed this article, you’ll love my content over at my YouTube channel, here, where I go into more detail about the evidenced-based facts on the performance and injury preventative advantages of forefoot running vs heel strike running.
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