Ultrasound imaging and range of motion testing will be performed on the same 10 subjects four times throughout one baseball season: before the first game of the season, after 20 games have been played, after 40 games have been played, and after the last game of the season has been played. During this period, pitching data will be collected and recorded for each pitcher. Data to be collected includes number of pitches thrown, number of each type of pitch thrown, number of innings pitched, velocity of all pitches, time in days between pitching appearances.