Welcome to BR....
I've been utilizing a physical routine the last several months to prepare my body and mind before leagues. I'm way out of shape, my mental focus has weakened, and doing the same prep work before I leave work for leagues has helped me greatly.
I trained in Martial Arts (and other sports) for 20 plus years and they way we warm up/stretch is the same way today since I joined in 1983. In high school ball, warm ups/stretches were the same as well. So, I decided to try this for bowling. I'm not sure if it's coincidence, but along with working on my game about the same time I started these routines, my average has gone up by 18 pins from my book.
I am able to post at the line longer and my left quad isn't sore. I don't get cramps on my calves as well. Most importantly, I make sure I drink lots of water and juice that day - beet, kale, carrots, apple and a drop of lemon juice is my favorite. There are others...
My 15 minutes routine consists of basic exercises and stretches (the ones I use for MA) that covers the major and minor muscles that are being used. I also swing an 8 lbs sandbag at work throughout the day similar to the power trainer at eileens bowing products. AND, very importantly, I do meditation during my 5:45 pm scheduled bowel movement hahahaha yeah I'm regular...
Seriously, I have attention/focus issues and getting into a routine has helped me stay focused on the lanes when needed to. I was programed since I was a kid to follow a routine, from feeding my dads animals at 5pm everyday to packing my backpack for karate practice and walking that mile to the dojo 6 times/days a week.
All those things I did from the chores to kata's were muscle and brain memory training. Train to not think and to react without thinking, and at the same time to remain flexible and adapt to changes. OSU!! (pronounced OSS) hehehe.... bowling is pretty much the same thing.