I’ve been playing now into my 2nd season after a 50 year layoff! Trying to improve my infield play,foot work reading the hop! Keeping it in mind glove! The rebounder doesn’t seem to produce great results but it’s still practice! That’s why I’m looking into a pitching machine.Don't get me started on the stupidity of hotter bats with harder balls. SMH.
Having said that, have you been playing regular softball and transitioning, no pun intended , to Senior or a novice looking to play Senior? If it's the latter, I would invest in a fielding mask and just go for it. If you're worried about the speed of the ball off the bat, play deeper. You should have ample time to throw people out, given it's Seniors.