It was explained the first time Barry went into the Speed Force. It pretty much takes the appearance of something the person in it can recognize and understand. The Speed Force just exists basically. What gets me is that the Speed Force has rules like being against traveling through time to the past but not against traveling through time to the future or to other Earths.
One of my biggest problems with 2009’s Flash Rebirth was Barry being the creator of the Speed Force, which is pure fanboy wankery. Like, I could SMELL the jizz when I read that. It just came off as some ill concieved method of trying to overstate Barry’s importance. I don’t hate Barry but you could tell the hardon Johns and many others at DC have for him is REALLY showing with that mess.
Another issue is that by making all the speedsters go after Barry, they ruined the growth of the other speedsters(Kid Flash and Jay Garrick). Not only do you have that issue, even by the end of Season 3, the other speedsters don’t really lead to anything. Savitar beating Jay, Jesse, Wally, and Barry should have led to an actual real Team Flash vs Savitar. And they wasted Black Flash and Reverse Flash never even showed up. So much potential wasted.
trust me i know. i grew up on wally and have all the issues with real importance on the speed force. it was the stupidest thing, and theirs still alot of issues in terms of reboot stuff.
because since we have og wally back…he should technically be faster than barry atm since barry is supposedly only been around a few years.