Disc golf, like other rotational sports such as golf and baseball, consists of a majority of one-sided repetitive movements. Because of this, asymmetrical muscle development occurs. Muscles used for a right handed backhand thrower will increase in strength while the opposite side of muscles that would be used for a left handed thrower will remain the same.
While some asymmetry in the human body is normal, it can also increase the risk of injury and pain. To lower this risk and increase overall strength of the body work developing strength on the opposite side of the body. Including some throws with your opposite arm during warm-up is one easy way to incorporate some strength. And you never know when using your opposite throwing arm may come in use for getting out of trouble.
Another effective way to fight asymmetry is to include strength training into your disc golf game. Especially in the off-season. It is a great time to work on both sides. One of the best types of exercises for this are medicine ball throws. They mimic throwing motion and can be done with both sides of the body. Be sure to check the med-ball exercises here to learn more about these exercises. When incorporating these exercises, focus on developing power through your legs, having a tight stable core, rotating the core and shoulders simultaneously, and finishing with your arms. Do the same amount of reps and sets with both sides of the body.