So im 15 years old. I have loved to ride bikes since i was 4. I used to be really good and ever since i was 7 i would ride 50 miles in a day with my dad on weekend bike rides. But at 12 i had knee surgery due to roughness on the back of my knee cap, they had to smooth it down. And ever since then i have not been riding. Do you think it would be bad to get riding again?