Which type of trainers for exercise classes indoors?

[Poppysball]

I need some trainers for indoor exercise classes. No gym equipment just a mix of classes, some aerobic, some slower paced.

Haven’t bought trainers for ages and current ones are always filthy from outdoor exercise.

I had a look over the weekend but there is so much choice I didn’t know what I should be looking for for this purpose?
Any ideas please? Not too expensive.

I just go and try them on in sports direct. Currently using Adidas ones

You need cross trainers rather than running trainers.
I went to JD sport & asked the assistant for advice on which were most suitable for the gym / classes.
I bought a pair of Nikes that are bright pink & orange as I like bright colours!