Video by doubletrouble_sphynx Crinkle and Wrinkle (doubletrouble_sphynx), two indoor sphynx cats, work out their energy with this exercise wheel. “Crinkle loves to run in her wheel, and she’s always climbing the endless circle,” says Ottelie Overeijnder, their human. “They run so gracefully and have such good technique. Somehow, they get really motivated when I start cheering.” #WHPcircles