The rear uppercut is not a commonly used punch in Muay Thai. However, it can be very effective when thrown from the right range and with good form and power. Establish proper range (see video). Drive from the hip and use a pivot + rotation of back foot and leg. Do not drop your hand at the beginning of the strike. Palm should face-in at the end of the punch. Make a tight first upon impact. Finish the punch with a shoulder roll.  …