I'll be the old man here and be really blunt. - It's two different sports man,, there is no way in hell I'd ever attempt to run a 20 min 5k again after running AAS for a few years and doing and training like I am,, Honestly I'd be afraid of having a heart attack .. Just some real world honest bro to bro advice here,, don't let your ego effect your health, it's not worth it in the long run