Its muscular growth is most obvious in its arms and upper body, and is less pronounced in its waist, hips, and legs.
Despite the Tank's incredible muscle mass, it is surprisingly fast and agile, able to keep up with a Survivor at full health. It can be assumed that its bones have grown in strength too, otherwise the Tank's skeleton would have collapsed under its own weight. Its most notable trait is its abnormally-increased muscle mass. The Tank is always a male who has experienced the most physical mutations of all of the infected. The Tank is voiced by Fred Tatasciore who also voiced the Boomer in the same game, Rhino in Marvel's Spider-Man, Bane in the Injustice series, Kakuzu from the Naruto series, and many more. It is the biggest threat to the Survivors and is a rare type of boss/special zombie, only able to spawn once per chapter. The Tank is the primary antagonist in Left 4 Dead and Left 4 Dead 2.
~ Nick, when being attacked by the Tank while incapacitated. MOTHER OF MERCY, THIS THING IS KILLING ME! ~ Louis, when asking Bill what to do when encountering the Tank for the first time.