Your should start in the stretch position when there are runners on the bases. Place your feet so they face third base if you throw right-handed or first base if you throw left-handed. The stretch is a faster way to pitch and you can maintain more balance, resulting in more control. Your right foot should be placed against the rubber, with your other foot one to two inches in front. This will enable you to get a full rotation with your hips, which will make you throw harder. If you start with your stride leg slightly back, simply shift your weight to that back leg.
The most common mistake pitchers make is to open their arms before their hips, which removes the power generated from their legs, causing pitchers to have less velocity, and increase the stress applied to their arms. [6] X Research source
During your motion, it is beneficial to be aware of your wrist. As you move your arm from your sweet spot, your wrist should be pulled back, cocking the ball in your hand. Then, as you release the ball, the ball should glide off of your wrist, finishing with your wrist fully flexed.
Focus on consistently throwing strikes before you try to improve your speed. [8] X Expert Source Isaac HessBaseball Coach & Instructor Expert Interview. 20 March 2020.
Run for 30 minutes after you pitch. This will get your blood circulating and help push out the lactic acid that might form in your arm.