Planning to stay in Sukhumvit for a month. Can you suggest me any cheap gyms where we can go to?

I and my gf are planning to visit Bangkok around Sukhumvit area (close to Terminal21) and will stay for nearly a month. We want to hit the gym in the morning.

Can you suggest some affordable (<500-1000 THB/month per person, our budget is <2500 THB for 2 of us) gyms that we can go to?

Thanks!

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