Death!

...

"My strength usage is so weak?" In that particular altar amidst the tens of thousands of golden altars on the black mountain range, David tried over and over. He tried for a total of tens of thousands of times. Even after using one entire day, his best score was still only 34.

He couldn't blame anybody.

Firstly it had been so many years he emphasized in his own physical strength. Without using the werewolf body or the vampire body. 

Even though the Vampire body was proficient in close combat, it would need to extract his blood core first. It didn't rely on muscles or bones to unleash its strength, it didn't even have a strength per se, hence it couldn't train in this aspect.

As for the Werewolf gene body, it was a blood and flesh life form, and it did emphasize on strength exertion!