These often include:
Your rotator cuff is the group of muscles and tendons surrounding your shoulder joint. Injury causes inflammation or a tear in these muscles and tendons, and it's a common cause of shoulder pain. This can make it difficult to carry out everyday tasks that require arm movement, such as hair brushing or getting dressed.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/how-to-avoid-injury-while-strength-training