Well, no wonder I feel like cr*p the whole time I run! I also know it takes me at least 30-45 minutes to feel good on the bike, unless I am going very slowly. At my age, that means close to an hour of warm up . So, I never get that runner's high, because it generally takes me close to 40 minutes to do a 5K and by then other things are hurting.
This is why I rarely do group rides, because they go out so quickly. Even my regular group who are mostly even older than me, do this. Then they wonder why I am always in the front at the end.
I think some people are just in need of more warm up time than others, Emily. Lately, I've been doing run-walk intervals, as it seems that mentally, that's all I can take. But something keeps me wanting to run.