The cross-training shoe is used for cross-training: a wide range of low-impact exercises for improving the upper body and overall well-being. Unlike regular sports shoes, these shoes are exclusively made for gym activities, such as weight lifting, kickboxing, Zumba, and sports games such as football, volleyball, and basketball.    Depending on how you use them, you can also use them for casual running, cycling, jogging, and everyday use. Therefore, cross trainers are multi-purpose, especially if you can't afford sport-specific shoes or find them cumbersome.