This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to get a bigger upper body
Do higher amounts of repetitions.
There are two main types of exercises you can do in regards to weight lifting. You can choose lower amounts of repetitions or higher amounts of repetitions.

OPT:
I. This will help to build muscles in your arms, back, and shoulders. Stand tall with your feet shoulder width apart and your toes turned out.
II. For example, if you do crunches to burn fat, you can do 70 repetitions per set with chest presses. Find a power pedometer online to use for specific stretches.
III. These exercises allow you to build muscle you may have otherwise not been able to work out with. Running a distance of 300 to 400 meters is one example of a high number of repetitions you can perform.
IV. Studies have shown that higher reps build more muscle mass. High volume sets, three to six, with repetitions ranging from six to 12, tend to increase muscle size.
The answer is:
IV.