AzTallRider, You are doing well, don't beat yourself up. You are riding with guys who have been at it a long while. With training you will be able to finish the bridging effort and stick with the group. It can really hurt when the effort is Z5 then having to recover while still in Z4. I'm not sure that I would want to ride with guys who blow red lights then drop the guys following the law. Hang in there and keep your head up. Remember you are a 50+ newbie and the young guys have youth on their side.