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Low Side Forearm Block (Sokumen Gedan Uchi Ude Uke)

Swing your Left arm forward and down from your Right side, to a low block position, as you step into Kiba Dachi with your Left foot

The striking part of the technique is the inside edge of your forearm
The knuckles of your Left fist will be facing the floor, palm towards the ceiling
Keep your Right hand in the crook of your Left elbow to augment the technique
Your Left arm will be virtually straight
Breathe out completely and tense all your body muscles for a brief moment on the completion of the move