That's funny, I have exactly the opposite effect with meditation: in the last two years I have been following teachings with which I resonated a lot and helped my meditation deepen a lot, and I attribute my newfound sports skills to this deepening. I was able to run 20km 2 weeks after taking up jogging again after a few years break, which is a distance I never managed in the past. I can see how my meditative work helps me switch the perception of effort and push further than I ever thought possible. The work with pain, effort and strong emotions in boxing also has a lot of parallels with my seated meditation practice. There is definitely something to the stereotype of the martial artist meditating in a cave