All humans can ride a bike, and swim in water. These are things I take for granted (like I'd go 'wtf is wrong with you' if you can't do either, and have done that to my friends). I learned to ride a bike when I was 7 years old, I think. I don't recall riding bikes when I was in grade 1, but I was probably on training wheels at the time.
I was also swimming since I was 8, FYI.