Frequency depends on volume and intensity. If your volume and intensity are low enough, you could work everything thrice a week if you wanted to. Genetics, age, gender and other factors will come into play, but the frequency with which a part is worked and how that affects its growth is most dependent on volume and intensity.
I work my legs hard four days a week. However, I use very low volume and a high intensity. Because of such low volume, the total amount of volume for my legs during one week is probably similar to that of others who work them once a week with many more sets and reps.




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