u/RotoLando

Trying to get a jump on the fall Little League season, because I know they're going to ask me to coach. I've only coached at the 7-8 yr old level, which was player/coach pitch. My son is now 10, and in his last season before majors (12u), and at least one coach is leaving.

Does anyone have any 2-hour practice plans they can point me towards? I have a few ideas from watching for the last two years. I've got Cal Ripken's book. USA Baseball has some good stuff on the app. Ron Polk's Baseball Handbook is awesome, but a little more advanced than the typical 10u level (unless I get a crop of baseball fanatics, which is unlikely).

Coaches, what are some of your favorite resources? I like to look at lots of stuff, and there is plenty of time, so the more the merrier.

I noticed my son missing consistently to his arm side (missing inside to a right handed batter).

The ball had good velocity. The path was straight and true, crossed the plate between the batters knees and belt, but it was inside more often than usual. Sometimes it hit the corner for a strike, sometimes it was off the plate, brushing the battery back.

I wasn't close enough to see what was going on mechanically, so, in general, what kind of things cause an arm side miss?

Looking for generalities, so I know what to look for next time on the mound.