My cat Brist

Some years ago, I had a cat called Brist. My husband chose the name because the cat was very quiet and “brist” in Basque is the onomatopoeia of …something very fast.

After riding on bike our bikes, (since you and your husband both rode bicycles, in other words, more than one bike, "bike" should be plural) we used to do some stretching exercises and Brist wanted to help us. So, it put its legs forward, just like cats do when they wake up. Then it put itself upside down and it moved its body to one side and then to the other one. (What you wrote is correct, but I think this sounds more natural)

It also loved to hang from the curtains and to swing like a monkey. After that, it went to one side of the sofa and they it (just one cat, so it is singular) scratched the fabric. I bought something a piece (piece is correct, but I think the word "something" or "an item" sounds more natural) in from the animal shop so that it could do it's the manicure there, but it was useless.

One day it fell down from the 5th floor and it was not injured at all! So, it was proved that the Spanish saying “El gato tiene 7 vidas” is real. (In the US we have the same saying but we say "the cat has 9 lives". How funny!)