Our whole team, including pitchers "stride out" after a game. They build up to near top speed from the foul line to a line even with 2B. They walk back to the line and repeat the striding out ~5Xs. This starts the process of flushing the lactic acid and junk out of the kids' legs and arms.
Then any pitchers that have thrown a significant amount ice their shoulder and elbow for 20 minutes. That afternoon or evening, if they have pitched in the morning, we have them perfome a series of "Jobe" exercises using tubes or bands and have them do 20 minutes of easy aerobic exercise, (walk, jog, swim, exercise bike). This starts the process of healing.
Next day they will just play catch and do some more aerobic exercise if possible.