I genuinely hate this manga but it is very fun to shit on. It falls into the same category as rent-a-girlfriend where I keep up to date with it because collectively watching the train wreck is fun.
Yeah I recall reading some (and dropping it because it's super dum) since the guy in that has the turbo version of the skill from this: one step=one level but he's a lazy-ass. It's called Level Up Just by Walking. In 10 Thousand Steps It Will Be Level 10000! and going from the reviews it sounds like super trash.
Sora is literally a one man tank, until you restrict his ability to move in a way that could be considered walking or a variant of walking(eg running, crawling, or swimming), the main factor would be what Sora perceives as walking