Gap between biceps and forearm

[TredOut]

All my dudes who lift - how big is the gap between your forearm and biceps when you flex under a 90 degree angle?

Mine is like 1,5". I hope it gets filled out a bit as I get older.

[Syzygy]

that's where your muscle insertion ends. I don't think you can fill it in really but making your arms bigger will make it look smaller. also mines a little under an inch.