In a recent article in the Oregonian, Hoobler explains that one's risk of shoulder injury increases dramatically without these exercises as "weak muscles can't stabilize your upper arm bone against your shoulder blade, allowing excessive motion between the two and encroaching on sensitive structures."
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Hoobler cites John Austin, an orthopedist in Oregon, who says "a medical diagnosis from a specialist is often necessary to rule out more serious problems related to the shoulder and to ensure appropriate treatment, even when imaging studies are normal."
One exercise that Hoobler says can help strengthen the shoulder is called "the wall press," which involves standing against a wall and sliding one's arms up, while keeping the back and pelvis on the wall.
According to the US National Library of Medicine, standard shoulder injury treatment involves rest, ice, compression and elevation (RICE).