Hey Fam, how do you feel about [url=http://tvtropes.org/pmwiki/pmwiki.php/Main/CharlesAtlasSuperpower]Charles Atlas Super Powers[/url]? 
I was thinking about the literal limitations of Blur, and I figured at present he's probably about at a high school athlete level of physical fitness, with a safe desync level of six times normal time speed. Like I said in his profile, his main limitation is normal human stamina. I was thinking that as the RP goes on his "level ups" will be attained through intense physical conditioning at Sanctum, which could give him enhanced endurance and even faster base running speed, well beyond normal human levels. 

Let's say he's flat out sprinting and going 20 mph(that'd be a pretty good high school athlete) and he goes full(safe) desync up to level six. He'd be going a relative speed of 120 mph. And also bear in mind that that's just flat out speed, and that in addition to that every action he takes, including his thoughts and reaction time, are also six times faster. 

I think that's a fair and fun base level, and that he could increase both his endurance and his safe desync range as the RP progresses. 

Thoughts on those limits?