Would you mind expanding on the details of your running form that you think are "bad"? Did you attempt to change these immediately? Change to what? How'd it

Would you mind expanding on the details of your running form that you think are "bad"? Did you attempt to change these immediately? Change to what? How'd it go? In you 5k to marathon training, what sort of paces did you typically train at? Was it all a jog or did you do any speed work? Thanks, from a curious bystander.