Originally Posted by
Rareearthmetal
He is out doing me in endurance it's like his lungs don't hurt after keeping a fast pace.
I ride Around el sereno and Glendale.
Also, we are all different. It's not a good idea to compare yourself to your brother. Maybe set some measurable and repeatable goals and use that as a basis for comparison. Something like the same 5, 10, or 20 mile ride.
Your brother may have some different attributes...but don't discount your own. It take lots of factors, mental and physical, to make a good athlete.