Usually every day after school me and some friends play wall ball after school. We don’t throw all out but usually around 50-75%. Then after someone gets 3 outs they go up to the wall, turn around, and we all throw the tennis ball at them from a shortish distant. (if you hit them shoulders or above then you go to the wall) But I also have a radar ball that I think is pretty close to being accurate. It use to come up as 73-74 but now comes up as 75-77 on my fastball (4seam). I usually dont throw baseballs that much but I do play wall ball every school day. (I plan to start throwing a lot more to get better control on my change-up and fastball)
I was wondering could it be that playing wall ball and throwing the tennis ball actually brought my speed up or could this somehow hurt my arm in the long run and the increase of speed was either nartural or something is wrong with the ball?