Todd Gurley is making good use of the stiff arm three games into his career. Jonathan Daniel Getty Images

Size, speed, power. Those were the obvious attributes that led the St. Louis Rams to draft rookie Todd Gurley with the 10th overall pick.

If that's not enough of a skill set for defenders to deal with, Gurley is flashing another part of his repertoire three games into his NFL career - a stiff arm that he referred to as his "signature move" early in training camp.

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"The stiff arm is natural," Gurley told the Rams official website. "It's just something we work on in practice, with coach. Extra stuff after practice."

Gurley is coming off a pair of huge games in his first two NFL starts, rushing for 305 yards on 49 carries to lead the league in both categories during that span. He said the success of a stiff arm is predicated on knowing when to properly utilize it.

"The key to the stiff arm is you can't show it too early, because then the defender knows what you're doing," Gurley said. "You've just got to strike it. You've got to strike it and keep it moving."

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