"a firm stride" is correct and usable in written English.
You can use it when referring to a determined walk or confident gait. For example, "She left the room with a firm stride, ready to take on the world."
Obadeyi was able to stride forward unopposed and squared to Slater, who looked up and planted a firm strike inside the near post from 22 yards.
On April 15th this year the chairman and chief executive of Sonangol, Angola's state oil firm, strode into a room decorated with extravagant flowers in central Beijing and shook hands with Xi Jinping, the Chinese vice-president and probable next general secretary of the Communist Party.
For while Europe's leaders rail against profits and wealth, its firms stride into new markets and rack up giant profits.
He walked with a firm gait, as if striding downhill.
"We continue to make little short strides and stay on a firm footing but it is very frustrating," added Tagg.
Originally from Austin, Texas, 25-year-old video producer Ethan approaches me with large, confident strides and greets me with a firm, "Nice to meet you, Emmanuel!" I feel horrible.
As played by Paul Bettany, lanky and sandy-haired, he strode onto Center Court, three times, to be exact, giving a firm but not ostentatious wave to his adoring fans.
A memorandum from Hickman-Brown Research Inc., a firm that conducts polls for the Gore campaign, says that Mr. Gore has made strides in important ways.
Bolt won while slowing in his final four strides in a time of 19.32 seconds, and he crossed the line with his head turned to keep a firm gaze on Blake.
