[loh]

Good advice here. 3RM in my opinion is even pushing it and not something you want to do often. 5RM is probably more ideal to do on a semi-regular basis.

Form is critical too, so with every single lift that you do, make sure you're using the correct form first, otherwise you're potentially wasting your time and putting yourself at risk of injury.

[matwood]

Agreed. Even a 3RM is something that I would no more than 2x/year. As I've gotten older I don't even do that. My workout weight goes up over time which means I'm getting stronger. But I'm not a complete young idiot anymore, and know avoiding injury is job one.