In professional football, there is no easing into the preseason.
Unlike most sports, the NFL expects its employees to report to training camp in tip-top shape, ready to get their hitting and tackling game on.
Baseball's spring training, for instance, involves mornings of long toss and playing catch, with afternoons spent hitting off a tee mixed with light stretching.
Football's camps involve brutal collisions with tackling dummies and sprint after sprint after sprint.
Baseball starts its training in the crisp spring air of Arizona and Florida. Football camps begin in the deadly thick, sticky stillness of July.
The NFL leaves no time for second, third or fourth impressions. Non-guaranteed contracts mean players must be impressive from the start, lest they be replaced by the next name on the depth chart.
For the St. Louis Rams, camp is just a week old, but some players have already made good impressions on the new coaching staff.
For a team coming off a 2-14 season in 2011 and is 15-65 since 2007, any good impression is worth highlighting.
Here are the five Rams who are making great impressions so far in Rams Camp.