I am very impressed with these commutes. I started commuting by bike five weeks ago, and I have significant fitness challenges, clearly. I have a (recurrent) torn medial meniscus in my L knee, and my L thigh strength is pretty horrible as a result.

I only commute TWO miles each way, with some short, maybe 15% grade hills that kick my butt (29.6 gear inches at the low end). My route is mostly hilly city streets (not arterials) and a flat MUP in the middle for about a mile. The harder ride is coming home, thankfully!

Thank you, everyone, for inspiring me to extend my commute when I don't have to rush home for family responsibilities!