You can do the online classes with stuff you have around the house.
Here is a list of items we usually use in class, and their replacement if you don’t have them:
Small dumbbels (2-5 kg) – Bottles of water
Kettlebells – Backpack full of heavy stuff like books
Fitball – This one you should really buy one :)
Elastic bands – Tights or an elastic t-shirt
Stick – Broomstick
Small ball – pillows
Half foam roller – pillows