About this course
Strength is a skill that can be learned. And you learn anything by doing a lot of repetitions.
Greasing the Groove means to perform a lot of reps of a certain exercise (multiple times a day and multiple days per week) so your muscles and central nervous system get used to (or learn to) perform the work. In other words, the reason why greasing the groove works so well is because it trains your nervous system to get more efficient at contracting your muscles. These neuro-muscular developments lead to fast strength gains without much effort on your part.
And if you think about it, it makes sense. If you start doing pull ups everyday, you'll get better at them because strength is a skill.
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