The Iron Fist Punch skill was a Heaven grade skill, which in the last decade Alex had managed to improve to the Immortal grade. Doing so, the technique's strength had improved by a tiny amount, enough to be noticeable. However, in the last hour, Alex had used his new Dao to improve the technique even further, finding better ways to use it.
He spent the last few hours looking into himself to see the movement of his Qi. The improvement itself came surprisingly easy to him now. He knew what sort of path his skills needed to take to be improved. In addition, the world helped him follow the right path too, by aiding him in the movement of Qi through his body.
That way, Alex had been able to improve his technique very quickly, compared to taking months at a time before.
He used the new technique finally and was surprised to find that it did not improve as well as he would've hoped it to.
