There are approximately 325 pairs of muscles in the human body, as each muscle has a corresponding opposite muscle. Swimming, a cardiovascular activity, uses muscles throughout the upper body, core and lower body to successfully carry out the sequence of moves involved with swimming. Swimming is a non-impact cardio activity, so you can work your muscles without putting impact on your joints.
The average pitcihng speed for an 8 year old. The average pitching speed for an 8 year old is 39 mph. The median pitching speed for an 8 year old is also 39 mph. The mode pitching speed for an 8 year old is 38 mph. The range of pitching speed for an 8 year old is 36 - 42 mph. Your goal should be 45+. The average pitcihng speed for a 9 year old.
Average for men-136 Hertz. Vocal folds more massive so rate of vibration is lower. Vocal folds more massive and rate of vibration slows down as boys age. Pitch is frequency of vibration. Females higher pitch because vibrate at higher rate. Male voices lower pitch because vibrate less. Children have 300s frequency, and higher pitch than we do.