Get that head down. Look for the button on top of their hats as they field grounders. Be sure to always have players stretch their arms. DON'T let them pick up a ball until their arm is warm. Step toward the target when throwing the ball, and follow through.
Elbow comes through first followed by hand and ball, fingers on top of the ball.
Use the 4-seam grip. Follow through on your throws by bringing the Throwing Side Hip around on your follow through. Don't sling it, push it or side-arm it. It also protects the arm from injury. You can play catch almost all year round.