I love waist trainers – I think they work. I used 3 on top of each other after my pregnancy, besides working with a personal trainer.
Only thing is I don’t recommend they be worn while working out or while sleeping. If you can train while you are sitting at a desk or at home (where no one see you) great!
Here is one I found and sold to my clients! https://amzn.to/33vCNwz
Its heavy duty. The clips are strong not like the others I’ve found on the market.
The workout ones I don’t really think are worth buying. It collects your sweat which makes it seem like its working but I would skip it. I recommend high waisted pants to hold and support your waist or spanxs.