The number of reps within a set can vary depending on the weight used, which muscles are being worked, etc.
But ST is really about the degree to which you are challenging your muscles, not about the number of reps you do. You should be aiming to fatigue your muscles with every set (fatigue means you feel you cannot do another rep with the correct form), and be using a weigh heavy enough to reach that fatigue point in 15 reps or less.
A weight heavy enough to reach that point in 4-6 reps is actually more effective than doing 12-15 reps with a lighter weight.
Personally, I will typically start off with weight that I can only do 4-6 reps, and gradually build this number over a few weeks. Once I get to 12, I add some more weight the next time, and it will be back to 4-6 weeks. Rinse and repeat.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
| current weight: 178.0