It is advisable to perform sets to complete muscular failure on safer exercises, such as hack squats or leg extensions, rather than riskier ones like barbell back squats.

“I like to train to failure all the freaking time. It's more fun. I've been training for a long time. I don't hurt myself with training to failure, and I wouldn't train to failure with a fricking bench press, or a squat. But you can choose the exercises that you can take to failure. Leg extension is one of them that you can take to failure, you can take to partials.”

“there's less issue of injury because, when you're going to fail, let's say, on a squat, if you've ever squatted, and you're in the hole and you're trying to push out, there's a greater potential for injury.”