Our expert says:
Yes, that's true - higher resistance, or heavier weights, builds muscle compared to lower weights. The number of reps is obviously then lower. So you might try to increase your weight, knock the reps down to say 8, and see how it goes.
In terms of sets, not necessarily. Quite a nice structure is to do 8 reps at a given weight, then increase the weight slightly, do 6 reps at that new weight, then come back down and finish on 8 reps at the starting weight. Or you can simply do 3 sets of 8, it's really not that significant unless you're going for very specific adaptations. I'd say go for that option.
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