I highly recommend bicycling, even when it's hot and humid and hilly. I do it, and it's an awesome start and end to the day. Also, for that distance I'd bet y

I highly recommend bicycling, even when it's hot and humid and hilly. I do it, and it's an awesome start and end to the day. Also, for that distance I'd bet your commute would be negligibly longer--for me it's about 10 minutes difference for about the same distance and I'd bet you'd be even faster in NYC. You get your exercise in, and you can't back out of the afternoon workout. You feel great, and you can ditch the gym membership. You generally have to shower in the AM anyway, so you're not wasting any time if you do it at work vice home. If you remain unconvinced, listen to software development podcasts; I've been following the Stanford iPhone development class.