### Instruction:
Think of a bunch of different ways you could lift weights at home without any dumbbells or gym equipment.

### Response:
1. Bodyweight training: Bodyweight training (calisthenics) is the easiest way to train at home without any gym equipment. It can help you build muscle mass and increase your strength.
2. Backpack: You can fill a backpack with books or other heavy things at home and use it instead of weights.
3. Plastic bottles: fill plastic bottles with water and duck tape them together. With a box of 6 x 2 L plastic bottles fully filled with water, you will have 12 KG of weights.