To Secure Enough Airtime
Mechanism / Why It Happens
Because of the way the trick rotates, the tail can easily hit the back foot.
In a forward or dolphin flip, the board rotates with the nose moving downward and the tail rising upward, so the tail can often hit the back foot. The solution is to make sure you jump high enough, but the ankles alone cannot generate enough force for a sufficient jump.
What to Do
Instead of relying on the ankles alone, coordinate the entire body to jump.
To gain enough jump height, you need to coordinate muscles throughout the body, including the hips,