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Running faster or further does NOT increase strength or add any benefits other than moderately increase cardio, a vest, however, will also increase cardio but at a higher level.
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Funny how running faster and further is what every elite runner does to improve their running. Set that aside.
Strength = the maximum force a muscle can exert i.e. a 1 rep maximum.
Most runners have between 160 and 180 footfalls per minute when running or 80 to 90 repetitions per leg. Over a 30 minute run, that's between 2400 and 2700 repetitions.
What's your 1RM bench? What's your 2500RM bench? Would you advise someone who is trying to increase his 1RM i.e. strength, to do sets of 2500?
As far as that article, LOL. Awesome how all of the improvement came when the runners STOPPED wearing the vest. In what peer reviewed journal was that "research" published?
Here's a hint that people should take: if you want to get stronger, read what elite strength athletes and strength coaches say - Rippetoe is popular here. If you want to be a better runner, read what elite runners and running coaches say - Jack Daniels, Arthur Lydiard, Rentao Canova.