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

 * When Coach help someone up,sometimes he say "Down and give me 20!Just kidding,I help you up".This is a possible reference to the Soldier from Team Fortress 2
 * 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 time he saw his grandmother, she asked if he was still a praying man.
 * Bill and Coach have many things in common. According to their back-stories, both Bill and Coach have knee injuries. They also are the oldest in their group, and have a dislike for climbing stairs. On top of that, they both have a different physical disadvantage. Bill's disadvantage is that he's older than anyone out of the two groups. On the other hand, Coach's disadvantage is that he is overweight, preventing him doing similar things to Bill. (Note how Bill is quite healthy for his age).
 * "Though I walk through the valley of the shadow of death" is a quote from the Bible, Psalms 23:4.
 * In an issue of PC Gamer, the original concepts of the Coach can be seen, including a skinny coach, a white coach, and a coach in football shoulder pads used as armor. He also holds a bow and arrows (depicted in the gallery below).
 * Coach appears to hold a pistol with only one hand when his health is lower than 40 HP.
 * It seems from the new trailer he highly enjoys chocolate, as he is seen eating a bar of it and Nick teases him with the idea of a chocolate helicopter to lead him up stairs quickly.
 * Coach's shirt has the abbreviation "FHS," which could mean that the school at which he coached could have a name that starts with an 'F' (F... High School).