A great sports bike I bought a few days ago, it's amazing and suitable for better fitness

A very beautiful and brand new sports bike, only had it for a few days, perfect for better exercise than walking. I recommend it to the first buyer at an attractive price; whoever is interested can take it assembled so they don't have to pay an engineer like me to assemble it. I bought it, truly excited about it, but when I tried riding it, my knees hurt, unfortunately I can't exercise on it.