Do some press-ups so your arms are able to stop your head hitting the floor.
Roll.
Watch some BMX'ers, the most underrated BMXing skill is the ability to fall off without hurting yourself.
Practice on grass.
Coulnd't agree more I bmxed for years before riding fixed, and I think knowing how to fall properly was the only thing that stopped me from smashing my head/face when I went over the bars a month or so ago thanks to a major lockring/cog slip (which then re-engaged!), I also do a fair amount of snowboarding each season which helps to a degree, but no where near as much as the 7-8 years of bmxing probably has.
Coulnd't agree more I bmxed for years before riding fixed, and I think knowing how to fall properly was the only thing that stopped me from smashing my head/face when I went over the bars a month or so ago thanks to a major lockring/cog slip (which then re-engaged!), I also do a fair amount of snowboarding each season which helps to a degree, but no where near as much as the 7-8 years of bmxing probably has.