Dreaming of having very developed muscles indicates vanity which will put the dreamer in disadvantage against any enemies that the dreamer might have. However, the dreamer will dominate and solve any problems that may arise. Dreaming of having flabby and weak muscles, insinuates that the dreamer recognizes his or her own inability to solve problems. If a woman has this same dream, then it indicates frustrations and failures.
Dream dictionary: Muscles dream meanings
To dream about muscles symbolizes power and strength. You need to develop your qualities and become stronger and more confident.