I don't know if this is the right thing to do
he's 7. We have always used a "calm down corner" and it has worked amazingly. However, he's a big boy! Very tall and I struggle to pick him up now, so we have had to get rid of it, as I can't put him back, but it has worked great for 5 years!
I've started a new technique of removing toys and putting them in a box on top of our shelves. They go there for around an hour, so he can calm down. It works great if it's the toy that's causing him to be 'naughty' (throwing it/not playing nicely, etc.) but if it's nothing to do with the toy, it really has no effect as he isn't even using the toy. He currently has no toys left, yet none of the reasons are even related to toys, so I find it isn't effective as it used to be when he had the "calm down corner" for other things and toy removal for related behaviour.
He has nothing right now, is that the right thing? He has bitten me and hurt my arm and it's just covered in scratches and bruises... It looks awful. He has never been like this, only since I have removed all toys, but he's too big to put in the "calm down corner" and that would have worked.