The question of repetitions has been long discussed in the fitness world.
But how many should you actually do in a workout?
Well, the answer depends on the goal that you have in mind.
Here are some general recommendations:
1. For the goal of increasing maximum strength - Train primarily in the 1-5 rep range and occasionally in the higher rep ranges.
2. For the goal of bulk muscle growth - Train primarily in the 6-15 rep range and occasionally in the 1-5 rep range
3. For the goal of endurance - Train with low intensity and high repetitions
Ultimately, the most determining factor for muscle growth is your total working volume.
That volume has to be of good quality and close to failure, in order to realize the best training stimulus possible.
However, training in the 1-5 rep range, may make it harder for you to create the same working volume and may increase the risk of injury.
For this reason, your best bet is to set your goal right and train according to your goal.