What should you do if you can't do windmill because your legs won't open wide but automatically come together when you're on your back?

Answer 1

This frustrating habit might be because your instincts fear that you might fall and get hurt, so your legs probably come together as if ready to land on your feet in case if your hands slip while doing the windmill.

To overcome this habit, try to sit down and practice kicking your legs high up, one at a time, as if you're doing the windmill. Use your hands to spin yourself as you continue kicking upwards. Once you get into the habit, try to do the windmill again, but remember to continuously kick high up as you keep spinning.

Good luck!