There is no one-size-fits-all answer to this question, as the best rep range for side delts will vary depending on the individual. However, some studies have shown that side delts may respond better to higher reps.

For example, one study found that people who performed lateral raises with 12-15 reps per set had greater gains in side delt size and strength than those who performed lateral raises with 6-8 reps per set.

Another study found that people who performed side lateral raises with 3 sets of 15 reps had greater gains in side delt size than those who performed side lateral raises with 3 sets of 8 reps.

However, it is important to note that these studies were relatively small, and more research is needed to confirm these findings.

Ultimately, the best way to determine the best rep range for your side delts is to experiment and see what works best for you. If you find that you are not seeing results with higher reps, you may want to try lowering the reps and increasing the weight.

Here are some other factors to consider when choosing a rep range for side delts:

• Your fitness level. If you are new to lifting weights, you may want to start with lower reps and higher weight. As you get stronger, you can gradually increase the reps and decrease the weight.
• Your goals. If your goal is to build size, you will need to focus on higher reps. If your goal is to build strength, you will need to focus on lower reps.
• Your individual preferences. Some people find that they get better results with higher reps, while others find that they get better results with lower reps. Experiment and see what works best for you.

It is also important to note that side delts are a small muscle group, so you do not need to do a lot of volume to see results. A few sets of 12-15 reps per week should be enough to stimulate growth.

If you are looking for specific exercises to target your side delts, here are a few suggestions:

• Lateral raises: This is a classic exercise for targeting the side delts. You can do lateral raises with dumbbells, cables, or machines.
• Upright rows: This exercise also targets the side delts, as well as the traps and biceps. You can do upright rows with dumbbells, cables, or machines.
• Face pulls: This exercise is a great way to strengthen the rear delts, but it can also help to target the side delts. You can do face pulls with a cable machine or with resistance bands.

By following these tips, you can choose the best rep range for your side delts and start seeing results.