Forming A Fist
Many students form their fists incorrectly which could result in more damage being done to yourself instead of your opponent. Your fingers should be curled under twice whilst your thumb should always go just underneath the two knuckles closest to you. A lot of students either make the error of placing their thumb inside their fist which is extremely dangerous or they simply bend their thumb into the side of their fist which means the thumb is vulnerable.
Remember: Always try and form a fist at all times during training if you are not using other hand formations. A lot of students open their fist between basic movements; this is mostly a subconscious habit which needs correcting. Also it is dangerous to have open hands during free sparring as this is when fingers may get kicked back and injuries occur.