The side kick exercise primarily targets the muscles of the glutes, hips, and thighs. Specifically, it works the gluteus medius, gluteus maximus, and tensor fasciae latae of the hips, as well as the quadriceps and hamstrings of the thighs.

The frequency with which you should do side kicks depends on your fitness level and goals. If you are just starting out, you may want to do side kicks two to three times per week. As you become more experienced, you can increase the frequency to four to five times per week. Make sure to rest between sets and to listen to your body to avoid overtraining.

To increase the intensity of a side kick workout, you can try adding resistance to your kicks by using ankle weights or resistance bands. You can also increase the number of repetitions, add plyometric exercises such as jump kicks, or increase the speed of your kicks. You can also try incorporating different kick variations into your workout, such as roundhouse kicks or hook kicks.

Common mistakes to avoid when performing side kicks include: 1. Not keeping your supporting leg straight and bent at the knee. 2. Not keeping your hips facing forward. 3. Not keeping your kicking leg fully extended. 4. Not keeping your head and chest up. 5. Not keeping your arms and hands in the proper position. 6. Not focusing on the target. 7. Not controlling the speed and power of the kick. 8. Not keeping your balance and stability.