Keep grip pressure light but secure for speed
The coach recommends keeping grip pressure light while still keeping a secure grip, and lightening the arms if they feel tense. He suggests a feel of about a 2 out of 10 - very light, almost like you're 'noodling.' His reasoning is that a looser muscle is a faster muscle, so lighter grip pressure can pick up roughly 5 to 10 miles an hour and may add some consistency and accuracy.
Channel: SagutoGolf
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Episode 3 quick tip on grip pressure.