Cheap trainers for exercise classes?

[LingDiLong]

I have a proper, expensive pair of trainers for running but they're really muddy so I need to get an 'indoor' pair for when I do classes; I mostly do kettlebells and boxing circuits. Is there anything I need to look out for particularly? Do I need to spend very much or can I get away with just a basic cheap pair?!

Thanks!

I do this. My indoor trainers are £4O-ish Nike revolutions. I love having pristine gym trainers. I've also got cheaper walking to the gym trainers.

my running trainers are in no way fit for public viewing.

Yes, mine are leaving a muddy trail in the class

I've been trying to check out people's feet in class but it's really dark in there!

I wear something that cost about £20 from sports direct.

Can I just throw in my tuppence worth? I bought cheap trainers for indoor gym stuff and they hurt my knees and feet. Think you're best off looking for a sale pair. I got my asiics with 30% off and they're lovely and very supportive. Should be lots on-line.

Oh bugger. I really don't want to risk causing myself an injury - I'll see if I can get a decent sales pair! Thanks!