Li Xuan was struck by heavenly lightning after making a vow and accidentally transmigrated, gaining a Fitness System.
In this world, strength is determined solely by the rank of one's bloodline. He relies on fitness to become an immortal. Are kings and nobles born to rule? Come learn about swimming and fitness.
“Bro, you guard the Southern Heavenly Gate. You should work out with me more.”
“Hey, fellow cultivator flying up there, your biceps could use some work. Let me take a look.”
“And you, fellow dog cultivator over there, wolf, dog, whatever. You ran off before finishing leg day last time. I'll make sure you catch up later.”
Whether you fly through the sky or run across the ground, if you want to get stronger, go work out.
It's confirmed, the protagonist is a fool