The walls of the Endless Tunnel that were made up of the StarForged Tungsten ores were without a doubt one of the best places to train his attacks in.
They were tough and durable, and Alex didn't have to worry about holding back his powers at all. In fact, it was advised that he didn't hold back at all, or he wouldn't be able to dislodge or break open any of the ores at all.
And that was what Alex wanted in the end after all.
His attacks began with his punches and palms. The Iron Fist punch and the Palm of the Sun were techniques that he had learned from the very beginning when he was in the Tiger Sect.
They weren't the strongest skills he had, but because their elements were Metal and Yang, they did end up being one of the strongest skills for sure.
Next was the Flame Mastery Scripture. Alex created a fiery bird using his will and sent it to strike the wall in front of him.