I tried to sag once. Last August I had pre-registered for a charity ride. Not too long, but with many many big climbs. In the meantime, I had bronchitis. But day-of I decided I could do the ride. I was quite wrong and finally after 2 stops I called them. Said they were on the way, so I told the outriders (motorcycles) to go on. They never came. Fortunately It was local, so I knew the roads well enough to make my way back. Poor girl waiting there got an wheezy earful.