Biking to work is great because it integrates exercise directly into your daily routine doubling the value of that time. The trick is to remove all the easy ways of being lazy and leaving the bike at home. My commute is 25 min bike ride to train station, 20-30 minute train ride, 15 min ride from station to office. For me it's mostly downhill to work and uphill back. I by my train pass by the month so skipping the bike ride and driving to work (say when its rainy or overcast) is a pure waste of money. The train ride gives me time to recover a bit between the two legs of the trip. I get to read and prepare for the day and not think about cars or NPR stories, its the only time of day that is truly mine.
The other thing I do is to invert the ratio of veggies to meat you consume. At least 51% plant matter (the fresh the better).
Also no french fries or soda.