If you rent a cupboard, put a set of bath products and dry towels in the cupboard (bath towels are also acceptable).

If there are no slippers in the gym, it is recommended to bring your own slippers to avoid beriberi.

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Anything else?

It is recommended to bring a pair of fitness gloves. If you do a lot of equipment, you will grind your hands.

If it's not too much trouble.

You can also bring:

Heart rate meter, heart rate belt, knee pads, sweat towel, kettle, MP3, earphone.