Ok, I'll dissect this post one part at a time.
One, practicing both grips at once does not work to benefit the other grip, with the exception of the right hand, which stays the same regardless. Matched Grip, or MG, works about 13-15 muscles in the arm (can't remember the exact number). Traditional Grip, or TC, works 4 in the left arm. Those muscles are similar and different to the MG muscles. Therefore, practicing both is overkill, and overworks certian muscles, such as the wrist. If you want a workout, practice in Traditional. With less muscles being used, the work effort is increased.
Two, practicing grips does NOT lead to faster playing, and certainly not 30 minutes. Technique and chop building exercises played on a daily basis leads to faster playing. Also, a trick is to not practice rudiments or technique on drums. Yes, you will have to play them on drums, so play them there. Practice them on pillows and no bounce, on table tops and insane bounce, with marching size sticks, or Wrist Builder solid metal sticks. Only through technique exercise and CORRECT APPLICATION will one benefit.
Three, why are we switching grips? There is no point. If you want to play Snare in Drum Corps or Jazz, then Traditional is what you want. If you want to play anything else including the already said, then go Matched. Traditional was only needed when drums were angled by slings. Now, we have stands, and therefore drums are now flat. Learning both is up to you personally. I know both cause I play everything, but I mostly play Traditional UNLESS There is a specific sound I wish to draw from the drum. In that case, switching grips becomes more plausible. But judging by you post, you have no notion of drawing out different sounds.
And to answer your question, Grips are a personal preference. I prefer TG, but can play MG when the situation calls for it. I'm not playing TG on Tympani, or MG on an angled drum.
Homki890
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