Swimming

Ackster didn't know if it was thanks to being at sea, but seeing and feeling the ripples in the water around him helped him understand how his mana was supposed to move after his strikes. It didn't help much during the strike. But Ackster had a feeling that it wasn't only his mana training method and affinity that suited the water element.

The Unimportant Whatever Art was likely also suitable for someone with an affinity for water. So, the deeper his connection with and understanding of water, the closer he would come to mastering the punch that left his arm in rags.

When he came up with that idea, Ackster started spending more time in the water. He swam, fought, and trained in and underwater.

It went surprisingly well. Ackster had feared he would sink like a stone after his muscle and bone density increased, especially his bone from Nold's secret technique. But he felt at home in the ocean and played around like a fish.