Alice was one hundred percent ready to kick Lex's bum at racing, but her legs were important limbs, okay? She couldn't have them getting strained or pulling some kind of muscle or breaking something, even from so little as running. While she waited in the corridor for her exercise buddy to arrive at the scene, the fifth year decided to go to the trouble of stretching out like she did for Quidditch, so as not to hurt herself.

She positioned herself on the ground with her legs in front of her, streeetching until she could reach her toes. Next were her arm stretches, and then splits- yep, she could DO those. Had to be agile for sports and things, stretches helped.

Taking care of herself, see? Gryffindors weren't always reckless.

Although the fact that two of them were about to race around in a corridor probably contradicted that.