Keendog
Professional
I can explain.
Almost all errors (you missed quite a few backhand ones by the way) are due to not getting to the ball in time and with good balance to execute a good shot ie footwork related errors. Having 3-4/10 knee and back pain is a factor that prevents me from committing to movement.
How can you do those exercises then? Your first 3 UE's as I saw them:
@ 0:38 you swung low to high on a mid court ball. From the base line it would've been a perfect forehand, but from there need to finish low as you don't need to lift the ball.
@1:00 you ran forwards and arrived at the ball front on. Only run for dropshots, you would want to hop/shuffle with body facing sideways when moving forward or backwards
@1:23 you had good intent and didn't miss by much, it looked like you decided to follow the shot in but started moving in before you completed the swing.
I know these well as I make all the same mistakes. It dosen't look like movement to me, you get there ok it's just you are arriving front-on a lot of the time and you want to arrive side-on. You seem a lot more comfortable moving side to side rather than forwards.
I liked the aggressive intent on his serve returns though, got some clean winners there. And you're pretty good at the net
Also, you keep missing all my hints about playing on that court....