I do both cardio (jogging, running, biking), and weight lifting.
I've done cardio for a long time, but I'm quite new to weight lifting (I've only
been doing it for the past 4 months).
I have some dumbbells and a pull-up bar at home. I go to the gym
to use barbells.
I only do cardio (outdoors) in the summer. I tried indoor cardio in the winter,
(stationary bike), but I found it incredibly boring. For me, the most fun thing
about biking/jogging, is the wind and fresh air blowing past me.
I also like swimming, but unfortunately there aren't any unchlorinated
pools near where I live. So I only swim in lakes when I go on a vacation
in the summer.
Also, I don't have a car, so I speed-walk everywhere, usually with
a heavy backpack (to school, to farmers' market, etc.).
I'm a grad student, and I find that exercise really improves my
studying/concentration.
-Mike