DARK SECRETS: Vikings safety harrison smith has been playing with a torn muscle since 2015 | Rare Historical Photos

If you need any other reasons to think Harrison Smith is one of the toughest NFL players, here it is. Back in 2015, Smith returned from an MCL injury but he was also playing with another injury — a tear. Smith told Alec Lewis with The Athletic how he was playing with a torn gracilis in his left leg.