Our expert says:
There is no definite answer to this, it depends. Usually between 10 and 15%, which means if you're lifting say 30kg in the 10 rep set, then you might go 35 in the 8 and 40 in the 6. But it's all relative to what you're capable of. For some, that final set of 6 at 40 might be too difficult, in which case smaller increases would be called for. You're also somewhat constrained by the increments in weights you'd be using.
My advice is to work backwards and find the weight that you can do 6 reps at without failure, and then go the other way to work out where to start.
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