Gym or Pilate places for women in Yokohama or Tokyo area?

Hey all! I’m 29F and lean more to the skinny side. Recently I have been wanting to get in a good shape and gain some glutes. As a foreigner I’m not sure of any good gym or Pilate places with probably some instructors to achieve the body I want. Could you please share some recommendations? Thanks a lot!

by ayahirani