Biking is easy:
1. when it's flat
2. when there's a nice breeze and shade
3. in the town lake trail where i'm the fastest vehicle and can self-importantly yell: "left!" while playing obstacle course with pedestrians and cyclists and dogs.
Biking is hard:
1. in the hill country parts of Austin
2. when there are cars on the roads.
3. when that big ball hot thing in the sky is over-enthusiastic.
Feel tired now, but awesome. Intense exercise is such a euphoria.