"Improve physique?"
"Thunder Dao enlightenment?"
Right now, Jiang He's physique and qi were so overwhelming he could match full-fledged Mahayana. Moreover, eating Dragoontooth Rice every day helped clear his body from any excesses, which is why he believed his body needs no improvement.
As for Thunder Dao enlightenment?
What a coincidence.
He had cultivated the Ninefold Thunderblades and grasped Thunder Will before, which counted as dabbling in Thunder Dao.
Still, that stuff didn't really improve his combat ability.
Nonetheless, Jiang He took a bite of the Thunder Dao Form.
He had a lot of these anyway, and he could test the flavor first.
Crack!