It’s appropriate that Stick It even has a title that sneers, for watching the movie is like spending an hour supervising detention. Missy Peregrym plays a former gymnastics star who has rebelled into the tomboy world of bike tricks. After her latest stunt, a judge orders her to attend a strict gymnastics academy. The gimmick contrived by writer-director Jessica Bendinger is that Peregrym will inject some extreme-sports attitude into the prissy gymnastics world, mainly by wearing rock T-shirts and telling her girly fellow athletes, “If you’re going to eat mat, eat mat hard.” With Jeff Bridges grimacing quite believably as her coach.