Buy a used copy of Wii Fit Plus from a thrift store (usually under $5) and rip it using your original Wii. You can patch your personal rip to "exclusive" standards using a community patch called Wiimms SZS Patcher , which restores the lost aerobics mode.
: Emulators allow you to load custom texture packs, which can replace the standard UI or Mii textures with higher-quality versions.