Today was my first commute day in years -- my toddler's going to be 3 soon, and for some reason, I seem to have more energy in recent months

It's also my first time to this site -- what a nice place! The commute's 7.5 miles one way -- I think that's 12 km (isn't the ratio 5:8?). I was expecting to feel worse by this time of the evening -- did notice some complaints in the knees, which seems to be a family trait, anyway. Definitely finding myself agreeing with the guy at the bikeshop who suggested some alternative seating arrangements! Part of the commute is near a busy freeway (it's 880, if you know the SF Bay Area), and I'm wondering about what I'm breathing in while I ride. But it was a beautiful day, the motorists were kind, and my kid wasn't left in daycare tooooo much longer than he's used to