Lol i am new to pivot but im good at animating :P
I done this at 30 FPS
Run to middle Slash, Jump slash again and flip.

It's a little bit weird when flip

ik my pivot lagged abit and i got too lazy to fix it xD

it's a bit stiff. The rest is ok for me

idk, all the anim seems weird to me, you should not use 60 fps, really you shouldnt, your not that good as you think :D good luck btw

Lol xD i used 30 FPS i had more then 60 frames xD

I didnt know lol i was new to the forums xD

can you do it better?

Yep

Use what ever fucking FPS you want, recommend 20, but if you are comfortable with 30, use 30. Everything is, well, bare bones beginner and you should stick to easy tests, swinging a ball back and forth, practicing easing, bouncing the ball to practice weight and adding these properties to a stick figure. Read Zed's Tutorial, and Mitch's tutorial (On TheDarkDemon.com) and really pay attention to them and try to emulate the things they say and show to get a feel for it.