circuit-training at home (almost daily, at least 5x a week)
brisk walking, at least 40 minutes each time. my neighborhood is very hilly, which is great for this.
arms. I do these all with light weights. I also do pull ups sometimes, and I use free weights for butterflies, rowing movements, etc.
I also do what I like to call the spiderman climb, which is done standing. I shift my weight from one leg to the other while doing a climbing motion with my arms, exaggerating the waist movements. I find this is great for my sides, abs, upper back, and shoulders.