Proper footwork for that first step to the ball - multiple directions.
Need 2 tennis balls and a wall. How many can you do in 30 seconds?
Infield footwork - fielding to your backhand side.
Infield drill - first step to the ball.
good drill to help developing the feel of "turning the barrel" and creating more whip in the swing.
Drill designed to get you arm in correct position when throwing.
Drills and good discussion about how to get your swing on plane early and increase chances of solid contact with the pitch.
Notice at 18 sec into video. You will need a PVC pipe or long broom handle for these drills. Helps create separation between top half and bottom half of swing.
Need a PVC pipe or broom stick for these stills. Good drills for working on bat angle through hitting zone. PVC pipe will give you feed back if doing correctly.
There are some good arm workouts here along with some general throwing info
Good drills for lower half of swing. Loading into rear hip and driving from that hip. There is an entire progression in this video.