Changing a movement habit
one of my handstand students is in the habit of bending his pushing leg as he kicks up to handstand. there is nothing wrong with this as a technique and some students enjoy success with it. however, i prefer it be an option rather than the only way that they can do it. also i should note that if you lack hamstring flexibility a fully straight leg can make a kick up harder.
ok back to my student. simply trying to push the floor away as he starts the kick up is not changing anything so the approach i am using is to isolate the movement that i want him to change.
without kicking to handstand just push the front leg straight. repeat it at least 10 times. then add in a small jump and repeat that 10 times. the only thing to focus on is that front leg and pushing it straight. finally without thinking about it do one full kick up. just one. then go back to the first step.
keep doing this until it feels normal. you can try the same thing with other movements. let me know how it goes.