“I was thinking of doing arms 2-3 times a week.Is it good to do that
and if i do that how i'm gonna cover my other body parts.”
If your goal is a balanced, aesthetic physique, then, “more is not necessarily better”. Hypertrophy is a very individual thing. There’s no specific set of exercises that will guarantee you growth for a specific muscle group. While exercise selection does contribute to muscle growth, I think it’s much more important to examine your approach to training. Ask yourself, “Is my training approach optimum for making muscular gains?”.
You need to understand that you build muscular size when you optimize your nutrition, sleep, and recovery. If one facet of your training is “off”, chances are, you will not make gains. Closely examining each of these should provide insight into any potential areas that are lacking.
If you feel that you’re training optimally, there is one change that may be effective for you. If you feel that a particular body part is lagging, you should take a look at prioritizing your routine. An excerpt from the National Strength and Conditioning Association indicates that
“The order of exercises within a workout significantly affects acute
lifting performance and subsequent changes in strength during
resistance training. The primary training goals should dictate the
exercise order. Exercises performed early in the workout are completed
with less fatigue, yielding greater rates of force development, higher
repetition number, and greater amount of weights lifted.”
If you feel that your arms are lacking, you should consider training biceps and triceps earlier in your routine. You should also consider using “pre-exhaustion” as a method to stimulate growth.
Lastly, achieving muscle growth, for those training drug-free, should be considered as a long term goal. If you consistently optimize your training, the cumulative effect should be obvious in later years.