Hello!
You can consider all activities with your hands, forearms and arms.
Consider floor exercises or exercises on your bed; such as stretches and lifting of weights with your hands and increasing gradually the number of repetitions.
You can also do leg raising, peddling and stretching with your right leg on your bed.
You can consider some activities if possible such as cooking, cleaning and dusting your house, washing your clothes, cleaning your car in the sitting position and increasing your other household chores just to increase heart rate and lose some calories.
The most important thing is strict diet control and you should avoid fried food, fast food, junk food, sodas and desserts completely.
Take care!
you can shadow box sitting down, it will bring your heart rate up