It's the most effective 'failure' training method there is in my opinion since it allows you to perform more reps with a heavy weight than would otherwise be possible. Dropsets take you to failure with progressively lighter weights but they certainly won't make you stronger.
The most popular example of rest pause training is 20 rep squats where you take your 10RM and rest pause your way to 20 reps when you hit failure. A lot of people have seen tremendous growth off this kind of training although it has to be used wisely. It's also a key part of DC (Doggcrapp) training. Do it all the time however and you'll quickly burn out. It's also not something I'd recommend to anyone new to training.
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