The article discussed the study of 449 men who were training for the Navy SEALS unit. During the approximate 25 week training program, about one-third of the men experienced injuries such as stress fractures, knee problems, and Achilles tendinitis
The article stated that people with low arches were nearly twice as likely as others to develop stress fractures. Additionally, people with tight calf muscles were more likely to develop Achilles tendinitis. To reduce that risk, calf muscle stretching exercises were recommended.