There was a time when I did 1000 push-ups a day to make my body stronger because I was already in the midst of my thirties. I’ve also started to do a lot of running and other endurance stuff. For sure this made me much stronger but at the same time seriously slower. I thought I’m just getting older…
When I stopped doing that because it didn’t improve my game I got noticeably faster again – and was kind of surprised. My explanation without having too much background information was that you can train your muscles for speed – or – strength – or – endurance but not everything on the same level at the same time.
You have to decide what you need for your sport.
If it’s tennis you for sure need the fast ones… 😉
Please read this very good article from Matt Kuzdub