To me the only element among those examples with any good potential is that "nu" fusion symbol (the one that looks like a sideways "s").

hhp

If this gym is for both men and women, I'd avoid an all-pink design, it looks feminine.

To be honest none of the designs really stand out to me, partly because the logo is so generic. There's nothing about it that says "gym" to me.

What's going to say "gym" though? Human bodies and lifting weights. It's so cliche that it might be a good idea to do something you might consider more generic, yet captivating. That sideways "s" might be a good start. I would try different shapes behind NU, different typefaces and definitely different colors if it's a unisex gym.

I hear you, it is a unisex gym.

Could I use blue with pink then?

What's going to say "gym" though?

Gym Source makes their initials into a stylized barbell (although their name at the bottom is careless and generic).

Maybe you could extend the sides of the U above the cap height and add dumbbell-shaped serifs. (Don't use a barbell. If you close the top it will read as NO GYM.)

I agree that weights, etc. are often used in gym logos, but this is a common problem in logo design. How do you design a logo without duplicating other logos?

With millions of logos in existence, it's hard to come up with anything that hasn't been used before, but you try to put a different twist on it, make it unique in some way.

I get the impression of a mobile app that allows you to communicate with other people who like the gym. The aesthetic is a bit dated too.

Pink is not a thoughtful choice for a mixed gym. Also, I would explore more appropriate fonts (these are too rigid for the purpose).

Integrating gym gear (dumbells or whatever) in the logo will look tacky. Besides many people who join a gym do it for using the treadmills, cross trainers or spinning classes. The macho image of dumbells may also give women a wrong impression of the gym identity. Is this a gym where people go to stay fit and healthy, or a "no pain no gain" bunker for hillbillies?

I would keep the overall thing clean, simple and dynamic. And pink, seriously. If it was an exclusive gym on say Miami South Beach, the kind with a vallet, maybe some pink would work. Otherwise, it will probably look cheap. As it does now.

Keep it simple:

I like the second designs very much . Change the colour pink if its unisex gym. if ita femalel gym pink will work.
design i like