Coach

Coach is one of the four playable survivors in Left 4 Dead 2. Coach was a high-school football instructor for a well playing team, but he suffered a nasty knee injury. Ironically, he's now a health teacher pushing 40 years old, but he's gone to seed since his collegiate glory days. The zombie apocalypse makes him wish he'd watched his own fitness more closely. Faliszek says Coach has "a great hatred for a few of the zombies—the Witch in particular," but naturally, he wouldn't explain why.

Quotes
"See: Coach/Quotes"

Trivia

 * Many players assume that Coach is Bill's Left 4 Dead 2 counterpart.
 * Many people relate Coach with the character Uncle Phil from the TV show The Fresh Prince of Bel-Air. He also resembles Bubb Rubb of "whistletips" fame.
 * Coach appears to have a slight speech impediment, occasionally dropping his R's and G's. This is probably due to Southern dialect.
 * He may also be somewhat religious as he usually makes comments referring to the Bible and stating the last he saw his grandmother, she asked if he was still a praying man.
 * He was the third one to be changed by Valve—even though he is still wearing yellow and blue clothes on a Swamp Fever poster, Comic Con demo shows him wearing purple and yellow shirt.
 * According to their back-stories, both Bill and Coach have knee injuries.
 * "Though I walk through the valley of the shadow of death" was originally a quote from the Bible, Psalms 23:4.
 * It appears that Coach is the second one to hold a pistol in one hand - as seen in PAX videos, it appears when he's low on health.