All cells have a cell membrane, one or more DNA chromosome(s), and cytoplasm.
1 No curveballs before age 14. 2  8-10 years old 52 pitches per game and no more than 2 games pitching per week 11-12 years old 68 pitches per game and no more than 2 games per week.3  Seek good pitching mechanics coaching and work on developing good balance trunk and lower extremity strength. 8-10 years old 52 pitches per game and no more than 2 games pitching per week 11-12 years old 68 pitches per game and no more than 2 games per week.
http://www.maddenbaseball.com Join the Free Newsletter. Here's a video I made on the average pitching speed for an 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, and 18 year old. It answers the number one question that I get on my site..how fast should I be throwing as a __ year old.