This is my first attempt at realism.
Please give me tips based on what I did in the replay.

I don't see how this is realistic o: since the gravity is -9.82 .

I know, but I tried. I tried to keep as much contact with the ground as possible.

It's little bits of the replay.

I think the term you are looking for is balance, not realism.

The replay had some pretty powerful looking hits in it, however they were all also grab hits, from what I saw.
Was still a pretty well done replay all in all however, it had some great style, good job.